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On February 23, 2018, PubMed Central Canada (PMC Canada) will be taken offline permanently. No author manuscripts will be deleted, and the approximately 2,900 manuscripts authored by Canadian Institutes of Health Research (CIHR)-funded researchers currently in the archive will be copied to the National Research Council’s (NRC) Digital Repository over the coming months. These manuscripts along with all other content will also remain publicly searchable on PubMed Central (US) and Europe PubMed Central, meaning such manuscripts will continue to be compliant with the Tri-Agency Open Access Policy on Publications.

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1.  Diagnostic Test Accuracy in Childhood Pulmonary Tuberculosis: A Bayesian Latent Class Analysis 
American Journal of Epidemiology  2016;184(9):690-700.
Evaluation of tests for the diagnosis of childhood pulmonary tuberculosis (CPTB) is complicated by the absence of an accurate reference test. We present a Bayesian latent class analysis in which we evaluated the accuracy of 5 diagnostic tests for CPTB. We used data from a study of 749 hospitalized South African children suspected to have CPTB from 2009 to 2014. The following tests were used: mycobacterial culture, smear microscopy, Xpert MTB/RIF (Cepheid Inc.), tuberculin skin test (TST), and chest radiography. We estimated the prevalence of CPTB to be 27% (95% credible interval (CrI): 21, 35). The sensitivities of culture, Xpert, and smear microscopy were estimated to be 60% (95% CrI: 46, 76), 49% (95% CrI: 38, 62), and 22% (95% CrI: 16, 30), respectively; specificities of these tests were estimated in accordance with prior information and were close to 100%. Chest radiography was estimated to have a sensitivity of 64% (95% CrI: 55, 73) and a specificity of 78% (95% CrI: 73, 83). Sensitivity of the TST was estimated to be 75% (95% CrI: 61, 84), and it decreased substantially among children who were malnourished and infected with human immunodeficiency virus (56%). The specificity of the TST was 69% (95% CrI: 63%, 76%). Furthermore, it was estimated that 46% (95% CrI: 42, 49) of CPTB-negative cases and 93% (95% CrI: 82; 98) of CPTB-positive cases received antituberculosis treatment, which indicates substantial overtreatment and limited undertreatment.
doi:10.1093/aje/kww094
PMCID: PMC5100832  PMID: 27737841
childhood pulmonary tuberculosis; diagnosis; latent class analysis; overtreatment; sensitivity;  specificity
2.  Evolution of gender representation among Canadian OTL-HNS residents: a 27-year analysis 
Background
The proportion of females enrolling into medical schools has been growing steadily. However, the representation of female residents among individual specialties has shown considerable variation. The purpose of this study was to compare the trends of gender representation in Otolaryngology – Head and Neck Surgery (OTL-HNS) residency programs with other specialty training programs in Canada. In order to contextualize these findings, a second phase of analysis examined the success rate of applicants of different genders to OTL-HNS residency programs.
Method
Anonymized data were obtained from the Canadian Residency Matching Service (CaRMS) and from the Canadian Post-M.D. Education Registry (CAPER) from 1988 to 2014. The differences in gender growth rates were compared to other subspecialty programs of varying size. Descriptive analysis was used to examine gender representation among OTL-HNS residents across years, and to compare these trends with other specialties. Bayesian hierarchical models were fit to analyze the growth in program rates in OTL-HNS based on gender.
Results
CaRMS and CAPER data over a 27 year period demonstrated that OTL-HNS has doubled its female representation from 20% to 40% between 1990 and 1994 and 2010-2014. The difference in annual growth rate of female representation versus male representation in OTL-HNS over this time period was 2.7%, which was similar to other large specialty programs and surgical subspecialties. There was parity in success rates of female and male candidates ranking OTL-HNS as their first choice specialty for most years.
Conclusions
Female representation in Canadian OTL-HNS residency programs is steadily increasing over the last 27 years. Large variation in female applicant acceptance rates was observed across Canadian universities, possibly attributable to differences in student body or applicant demographics. Factors influencing female medical student career selection to OTL-HNS require further study to mitigate disparities in gender representation and identify barriers to prospective female OTL-HNS applicants.
doi:10.1186/s40463-017-0232-0
PMCID: PMC5576270  PMID: 28851430
Gender; Female; Diversity; Minority; Otolaryngology; Residents
3.  Accuracy of administrative claims data for cerebral palsy diagnosis: a retrospective cohort study 
CMAJ Open  2017;5(3):E570-E575.
Background:
Cerebral palsy is the most common cause of childhood physical disability, with multiple associated comorbidities. Administrative claims data provide population-level prevalence estimates for cerebral palsy surveillance; however, their diagnostic accuracy has never been validated in Quebec. This study aimed to assess the accuracy of administrative claims data for the diagnosis of cerebral palsy.
Methods:
We conducted a retrospective cohort study of children with cerebral palsy born between 1999 and 2002 within 6 health administrative regions of Quebec. Provincial cerebral palsy registry data (reference standard) and administrative physician claims were linked. We explored differences between true-positive and false-negative cases using subgroup sensitivity analysis.
Results:
A total of 301 children were identified with confirmed cerebral palsy from the provincial registry, for an estimated prevalence of 1.8 (95% confidence interval [CI] 1.6-2.1) per 1000 children 5 years of age. The sensitivity and specificity of administrative claims data for cerebral palsy were 65.5% (95% CI 59.8%-70.8%) and 99.9% (95% CI 99.9%-99.9%), respectively, yielding a prevalence of 2.0 (95% CI 1.9-2.3) per 1000 children 5 years of age. The positive and negative predictive values were 58.8% (95% CI 53.3%-64.1%) and 99.9% (95% CI 99.9%-99.9%), respectively. The κ value was 0.62 (95% CI 0.57-0.67). Administrative claims data were more sensitive for children from rural regions, born preterm, with spastic quadriparesis and with higher levels of motor impairment.
Interpretation:
Administrative claims data do not capture the full spectrum of children with cerebral palsy. This suggests the need for a more sensitive case definition and caution when using such data without validation.
doi:10.9778/cmajo.20170013
PMCID: PMC5621965  PMID: 28720597
4.  Clinically Apparent Arterial Thrombosis in Persons with Systemic Vasculitis 
Objective
To estimate the incidence rate of clinically apparent arterial thrombotic events and associated comorbidities in patients with primary systemic vasculitis.
Methods
Using large cohort administrative data from Quebec, Canada, we identified patients with vasculitis, including polyarteritis nodosa (PAN) and granulomatosis with polyangiitis (GPA). Incident acute myocardial infarctions (AMIs) and cerebrovascular accidents (CVAs) after the diagnosis of vasculitis were ascertained in the PAN and GPA group via billing and hospitalization data. These were compared to rates of a general population comparator group. The incidences of comorbidities (type 2 diabetes mellitus, dyslipidemia, and hypertension) were also collected.
Results
Among the 626 patients identified with vasculitis, 19.7% had PAN, 2.9% had Kawasaki disease, 23.8% had GPA, 52.4% had GCA, and 1.3% had Takayasu arteritis. The AMI rate was substantially higher in males aged 18–44 with PAN, with rates up to 268.1 events per 10,000 patient years [95% CI 67.1–1070.2], approximately 30 times that in the age- and sex-matched control group. The CVA rate was also substantially higher, particularly in adults aged 45–65. Patients with vasculitis had elevated incidences of diabetes, dyslipidemia, and hypertension versus the general population.
Conclusion
Atherothrombotic rates were elevated in patients identified as having primary systemic vasculitis. While incident rates of cardiovascular comorbidities were also increased, the substantial elevation in AMIs seen in young adults suggests a disease-specific component which requires further investigation.
doi:10.1155/2017/3572768
PMCID: PMC5497634  PMID: 28713428
5.  Physician step prescription and monitoring to improve ARTERial health (SMARTER): A randomized controlled trial in patients with type 2 diabetes and hypertension 
Diabetes, Obesity & Metabolism  2017;19(5):695-704.
Aims
There are few proven strategies to enhance physical activity and cardiometabolic profiles in patients with type 2 diabetes and hypertension. We examined the effects of physician‐delivered step count prescriptions and monitoring.
Methods
Participants randomized to the active arm were provided with pedometers and they recorded step counts. Over a 1‐year period, their physicians reviewed their records and provided a written step count prescription at each clinic visit. The overall goal was a 3000 steps/day increase over 1 year (individualized rate of increase). Control arm participants were advised to engage in physical activity 30 to 60 min/day. We evaluated effects on step counts, carotid femoral pulse wave velocity (cfPWV, primary) and other cardiometabolic indicators including haemoglobin A1c in diabetes (henceforth abbreviated as A1c) and Homeostasis Model Assessment‐Insulin Resistance (HOMA‐IR) in participants not receiving insulin therapy.
Results
A total of 79% completed final evaluations (275/347; mean age, 60 years; SD, 11). Over 66% of participants had type 2 diabetes and over 90% had hypertension. There was a net 20% increase in steps/day in active vs control arm participants (1190; 95% CI, 550‐1840). Changes in cfPWV were inconclusive; active vs control arm participants with type 2 diabetes experienced a decrease in A1c (−0.38%; 95% CI, −0.69 to −0.06). HOMA‐IR also declined in the active arm vs the control arm (ie, assessed in all participants not treated with insulin; −0.96; 95% CI, −1.72 to −0.21).
Conclusions
A simple physician‐delivered step count prescription strategy incorporated into routine clinical practice led to a net 20% increase in step counts; however, this was below the 3000 steps/day targeted increment. While conclusive effects on cfPWV were not observed, there were improvements in both A1c and insulin sensitivity. Future studies will evaluate an amplified intervention to increase impact.
doi:10.1111/dom.12874
PMCID: PMC5412851  PMID: 28074635
arterial stiffness; carotid femoral pulse wave velocity; diabetes; hypertension; pedometer; physical activity; step counter
6.  Biomass Burning as a Source of Ambient Fine Particulate Air Pollution and Acute Myocardial Infarction 
Epidemiology (Cambridge, Mass.)  2017;28(3):329-337.
Supplemental Digital Content is available in the text.
Background:
Biomass burning is an important source of ambient fine particulate air pollution (PM2.5) in many regions of the world.
Methods:
We conducted a time-stratified case-crossover study of ambient PM2.5 and hospital admissions for myocardial infarction (MI) in three regions of British Columbia, Canada. Daily hospital admission data were collected between 2008 and 2015 and PM2.5 data were collected from fixed site monitors. We used conditional logistic regression models to estimate odds ratios (ORs) describing the association between PM2.5 and the risk of hospital admission for MI. We used stratified analyses to evaluate effect modification by biomass burning as a source of ambient PM2.5 using the ratio of levoglucosan/PM2.5 mass concentrations.
Results:
Each 5 µg/m3 increase in 3-day mean PM2.5 was associated with an increased risk of MI among elderly subjects (≥65 years; OR = 1.06, 95% CI: 1.03, 1.08); risk was not increased among younger subjects. Among the elderly, the strongest association occurred during colder periods (<6.44°C); when we stratified analyses by tertiles of monthly mean biomass contributions to PM2.5 during cold periods, ORs of 1.19 (95% CI: 1.04, 1.36), 1.08 (95% CI: 1.06, 1.09), and 1.04 (95% CI: 1.03, 1.06) were observed in the upper, middle, and lower tertiles (Ptrend = 0.003), respectively.
Conclusion:
Short-term changes in ambient PM2.5 were associated with an increased risk of MI among elderly subjects. During cold periods, increased biomass burning contributions to PM2.5 may modify its association with MI.
doi:10.1097/EDE.0000000000000636
PMCID: PMC5389593  PMID: 28177951
7.  Canadian Society of Allergy and Clinical Immunology annual scientific meeting 2016 
Alsayegh, Mohammad A. | Alshamali, Hanan | Khadada, Mousa | Ciccolini, Amanda | Ellis, Anne K. | Quint, Diana | Powley, William | Lee, Laurie | Fiteih, Yahya | Baksh, Shairaz | Vliagoftis, Harissios | Gerega, Sebastien K. | Millson, Brad | Charland, Katia | Barakat, Stephane | Sun, Xichun | Jimenez, Ricardo | Waserman, Susan | FitzGerald, Mark J. | Hébert, Jacques | Cognet-Sicé, Josiane | Renahan, Kevin E. | Huq, Saiful | Chooniedass, Rishma | Sawyer, Scott | Pasterkamp, Hans | Becker, Allan | Smith, Steven G. | Zhang, Shiyuan | Jayasundara, Kavisha | Tacon, Claire | Simidchiev, Alex | Nadeau, Gilbert | Gunsoy, Necdet | Mullerova, Hana | Albers, Frank | Kim, Young Woong | Shannon, Casey P. | Singh, Amrit | Neighbour, Helen | Larché, Mark | Tebbutt, Scott J. | Klopp, Annika | Vehling, Lorena | Becker, Allan B. | Subbarao, Padmaja | Mandhane, Piushkumar J. | Turvey, Stuart E. | Sears, Malcolm R. | Azad, Meghan B. | Loewen, Keely | Monchka, Barret | Mahmud, Salaheddin M. | Jong, Geert ‘t | Longo, Cristina | Bartlett, Gillian | Ducharme, Francine M. | Schuster, Tibor | MacGibbon, Brenda | Barnett, Tracie | North, Michelle L. | Brook, Jeff | Lee, Elizabeth | Omana, Vanessa | Thiele, Jenny | Steacy, Lisa M. | Evans, Greg | Diamond, Miriam | Sussman, Gordon L. | Amistani, Yann | Abiteboul, Kathy | Tenn, Mark W. | Yang, ChenXi | Carlsten, Christopher | Conway, Edward M. | Mack, Douglas | Othman, Yasmin | Barber, Colin M. | Kalicinsky, Chrystyna | Burke, Andrea E. | Messieh, Mary | Nair, Parameswaran | Che, Chun T. | Douglas, Lindsay | Liem, Joel | Duan, Lucy | Miller, Charlotte | Dupuis, Pascale | Connors, Lori A. | Fein, Michael N. | Shuster, Joseph | Hadi, Hani | Polk, Brooke | Raje, Nikita | Labrosse, Roxane | Bégin, Philippe | Paradis, Louis | Roches, Anne Des | Lacombe-Barrios, Jonathan | Mishra, Sanju | Lacuesta, Gina | Chiasson, Meredith | Haroon, Babar | Robertson, Kara | Issekutz, Thomas | Leddin, Desmond | Couban, Stephen | Connors, Lori | Roos, Adrienne | Kanani, Amin | Chan, Edmond S. | Schellenberg, Robert | Rosenfield, Lana | Cvetkovic, Anna | Woodward, Kevin | Quirt, Jaclyn | Watson, Wade T. A. | Castilho, Edson | Sullivan, Jennifer A. | Temple, Beverley | Martin, Donna | Cook, Victoria E. | Mills, Christopher | Portales-Casamar, Elodie | Fu, Lisa W. | Ho, Alexander | Zaltzman, Jeffrey | Chen, Lucy | Vadas, Peter | Gabrielli, Sofianne | Clarke, Ann | Eisman, Harley | Morris, Judy | Joseph, Lawrence | LaVieille, Sebastien | Ben-Shoshan, Moshe | Graham, François | Barnes, Charles | Portnoy, Jay | Stagg, Vincent | Simons, Elinor | Lefebvre, Diana | Dai, David | Mandhane, Piushkumar | Sears, Malcolm | Tam, Herman | Simons, F. Estelle R. | Alotaibi, Dhaifallah | Dawod, Bassel | Tunis, Matthew C. | Marshall, Jean | Desjardins, Marylin | Béland, Marianne | Lejtenyi, Duncan | Drolet, Jean-Phillipe | Lemire, Martine | Tsoukas, Christos | Noya, Francisco J.D. | Alizadehfar, Reza | McCusker, Christine T. | Mazer, Bruce D. | Maestre-Batlle, Danay | Gunawan, Evelyn | Rider, Christopher F. | Bølling, Anette K. | Pena, Olga M. | Suez, Daniel | Melamed, Isaac | Hussain, Iftikhar | Stein, Mark | Gupta, Sudhir | Paris, Kenneth | Fritsch, Sandor | Bourgeois, Christelle | Leibl, Heinz | McCoy, Barbara | Noel, Martin | Yel, Leman | Scott, Ori | Reid, Brenda | Atkinson, Adelle | Kim, Vy Hong-Diep | Roifman, Chaim M. | Grunebaum, Eyal | AlSelahi, Eiman | Aleman, Fernando | Oberle, Amber | Trus, Mike | Sussman, Gordon | Kanani, Amin S. | Chambenoi, Olivier | Chiva-Razavi, Sima | Grodecki, Savannah | Joshi, Nikhil | Menikefs, Peter | Holt, David | Pun, Teresa | Tworek, Damian | Hanna, Raphael | Heroux, Delia | Rosenberg, Elli | Stiemsma, Leah | Turvey, Stuart | Denburg, Judah | Mill, Christopher | Teoh, Timothy | Zimmer, Preeti | Avinashi, Vishal | Paina, Mihaela | Darwish Hassan, Ahmed A. | Oliveria, John Paul | Olesovsky, Chris | Gauvreau, Gail | Pedder, Linda | Keith, Paul K. | Plunkett, Greg | Bolner, Michelle | Pourshahnazari, Persia | Stark, Donald | Vostretsova, Kateryna | Moses, Andrew | Wakeman, Andrew | Singer, Alexander | Gerstner, Thomas | Abrams, Elissa | Johnson, Sara F. | Woodgate, Roberta L.
doi:10.1186/s13223-017-0192-y
PMCID: PMC5390240
8.  Carotid femoral pulse wave velocity in type 2 diabetes and hypertension: capturing arterial health effects of step counts 
Journal of Hypertension  2017;35(5):1061-1069.
Objective:
Optimal medication use obscures the impact of physical activity on traditional cardiometabolic risk factors. We evaluated the relationship between step counts and carotid-femoral pulse wave velocity (cfPWV), a summative risk indicator, in patients with type 2 diabetes and/or hypertension.
Research design and methods:
Three hundred and sixty-nine participants were recruited (outpatient clinics; Montreal, Quebec; 2011–2015). Physical activity (pedometer/accelerometer), cfPWV (applanation tonometry), and risk factors (A1C, Homeostatic Model Assessment–Insulin Resistance, blood pressure, lipid profiles) were evaluated. Linear regression models were constructed to quantify the relationship of steps/day with cfPWV.
Results:
The study population comprised 191 patients with type 2 diabetes and hypertension, 39 with type 2 diabetes, and 139 with hypertension (mean ± SD: age 59.6 ± 11.2 years; BMI 31.3 ± 4.8 kg/m2; 54.2% women). Blood pressure (125/77 ± 15/9 mmHg), A1C (diabetes: 7.7 ± 1.3%; 61 mmol/mol), and low-density lipoprotein cholesterol (diabetes: 2.19 ± 0.8 mmol/l; without diabetes: 3.13 ± 1.1mmol/l) were close to target. Participants averaged 5125 ± 2722 steps/day. Mean cfPWV was 9.8 ± 2.2 m/s. Steps correlated with cfPWV, but not with other risk factors. A 1000 steps/day increment was associated with a 0.1 m/s cfPWV decrement across adjusted models and in subgroup analysis by diabetes status. In a model adjusted for age, sex, BMI, ethnicity, immigrant status, employment, education, diabetes, hypertension, medication classes, the mean cfPWV decrement was 0.11 m/s (95% confidence interval −0.2, −0.02).
Conclusions:
cfPWV is responsive to step counts in patients who are well controlled on cardioprotective medications. This ability to capture the ‘added value’ of physical activity supports the emerging role of cfPWV in arterial health monitoring.
doi:10.1097/HJH.0000000000001277
PMCID: PMC5377988  PMID: 28129250
accelerometer; applanation tonometry; arterial stiffness; diabetes mellitus; hypertension; pedometer; physical activity
9.  Beliefs, Behaviors, and Perceptions of Community-Led Total Sanitation and Their Relation to Improved Sanitation in Rural Zambia 
Inadequate hygiene and sanitation remain leading global contributors to morbidity and mortality in children and adults. One strategy for improving sanitation access is community-led total sanitation (CLTS), in which participants are guided into self-realization of the importance of sanitation through activities called “triggering.” This qualitative study explored community members' and stakeholders' sanitation, knowledge, perceptions, and behaviors during early CLTS implementation in Zambia. We conducted 67 in-depth interviews and 24 focus group discussions in six districts in Zambia 12–18 months after CLTS implementation. Triggering activities elicited strong emotions, including shame, disgust, and peer pressure, which persuaded individuals and families to build and use latrines and handwashing stations. New sanitation behaviors were also encouraged by the hierarchical influences of traditional leaders and sanitation action groups and by children's opinions. Poor soil conditions were identified as barriers to latrine construction. Taboos, including prohibition of different generations of family members, in-laws, and opposite genders from using the same toilet, were barriers for using sanitation facilities. CLTS, through community empowerment and ownership, produced powerful responses that encouraged construction and use of latrines and handwashing practices. These qualitative data suggest that CLTS is effective for improving sanitation beliefs and behaviors in Zambia.
doi:10.4269/ajtmh.15-0335
PMCID: PMC4775890  PMID: 26787149
10.  Anaphylaxis across two Canadian pediatric centers: evaluating management disparities 
Background
There are no data on the percentage of visits due to anaphylaxis in the emergency department (ED), triggers, and management of anaphylaxis across different provinces in Canada.
Objective
To compare the percentage of anaphylaxis cases among all ED visits, as well as the triggers and management of anaphylaxis between two Canadian pediatric EDs (PEDs).
Methods
As part of the Cross-Canada Anaphylaxis Registry (C-CARE), children presenting to the British Columbia Children’s Hospital (BCCH) and Montreal Children’s Hospital (MCH) EDs with anaphylaxis were recruited. Characteristics, triggers, and management of anaphylaxis were documented using a standardized data entry form. Differences in demographics, triggers, and management were determined by comparing the difference of proportions and 95% confidence interval.
Results
Between June 2014 and June 2016, there were 346 visits due to anaphylaxis among 93,730 PED visits at the BCCH ED and 631 anaphylaxis visits among 164,669 pediatric visits at the MCH ED. In both centers, the majority of cases were triggered by food (BCCH 91.3% [88.7, 94.0], MCH 82.4% [79.7, 85.3]), of which peanuts were the most common culprit (24.7% [20.9, 29.9] and 19.0% [15.8, 22.7], respectively). Pre-hospital administration of epinephrine (BCCH 27.7% [23.2, 32.8], MCH 33.1% [29.5, 37.0]) and antihistamines (BCCH 50.6% [45.2, 56.0], MCH 47.1% [43.1, 51.0]) was similar. In-hospital management differed in terms of increased epinephrine, antihistamine, and steroid use at the BCCH (59.2% [53.9, 64.4], 59.8% [54.4, 65.0], and 60.1% [54.7, 65.3], respectively) compared to the MCH (42.2% [38.3, 46.2], 36.2% [32.5, 40.1], and 11.9% [9.5, 14.8], respectively). Despite differences in management, percentage of cases admitted to the intensive care unit was similar between the two centers.
Conclusion
Compared to previous European and North American reports, there is a high percentage of anaphylaxis cases in two PEDs across Canada with substantial differences in hospital management practices. It is crucial to develop training programs that aim to increase epinephrine use in anaphylaxis.
doi:10.2147/JAA.S123053
PMCID: PMC5221795  PMID: 28115856
anaphylaxis; emergency department; epinephrine; triggers of anaphylaxis; management
11.  AllerGen’s 8th research conference 
Arrieta, Marie-Claire | Arevalos, Andrea | Stiemsma, Leah | Chico, Marta E. | Sandoval, Carlos | Jin, Minglian | Walter, Jens | Cooper, Phil | Finlay, Brett | Bernatchez, Emilie | Gold, Matthew J. | Langlois, Anick | Blais-Lecours, Pascale | Duchaine, Caroline | Marsolais, David | McNagny, Kelly M. | Blanchet, Marie-Renée | Brubacher, Jordan | Chhetri, Bimal | Sabaliauskas, Kelly | Bassil, Kate | Kwong, Jeff | Coates, Frances | Takaro, Tim K. | Chow, Angela | Miller, Gregory E. | Chen, Edith | Mandhane, Piushkumar J. | Turvey, Stuart E. | Elliott, Susan J. | Becker, Allan B. | Subbarao, Padmaja | Sears, Malcolm R. | Kozyrskyj, Anita L. | Dubeau, Aimée | Lu, Zihang | Balkovec, Susan | Kowalik, Krzysztof | Gustafsson, Per | Ratjen, Felix | Edgar, Rachel D. | Bush, Nicole R. | MacIssac, Julie L. | McEwen, Lisa M. | Boyce, Thomas W. | Kobor, Michael S. | Emmerson, Melanie | Dubeau, Aimée | Lu, Zihang | Shen, Bingqing | Kowalik, Krzysztof | Ratjen, Felix | Moraes, Theo J. | Gabrielli, Sofianne | Clarke, Ann | Eisman, Harley | Morris, Judy | Joseph, Lawrence | LaVieille, Sebastien | Ben-Shoshan, Moshe | Islam, Sumaiya A. | Brückmann, Christof | Nieratschker, Vanessa | Jamieson, Kyla C. | Proud, David | Kanagaratham, Cynthia | Camateros, Pierre | Kopriva, Frantisek | Henri, Jennifer | Hajduch, Marian | Radzioch, Danuta | Kang, Liane J. | Koleva, Petya T. | Field, Catherine J. | Konya, Tedd | Scott, James A. | Konya, Theodore | Azad, Meghan B. | Brook, Jeff | Guttman, David | Kumari, Manjeet | Bridgman, Sarah L. | Tun, Mon H. | Mandal, Rupasri | Wishart, David S. | Lee, Amy H. Y. | Xia, Jeff | Gill, Erin | Hancock, Bob | Maestre, Danay | Sutherland, Darren | Hirota, Jeremy | Pena, Olga | Carlsten, Christopher | McEwen, Lisa M. | Jones, Meaghan J. | MacIsaac, Julia L. | Dow, William H. | Rosero-Bixby, Luis | Rehkopf, David H. | Morimoto, Takeshi | Smith, Steven G. | Oliveria, John-Paul | Beaudin, Suzanne | Schlatman, Abbey | Howie, Karen | Obminski, Caitlin | Nusca, Graeme | Sehmi, Roma | Gauvreau, Gail M. | O’Byrne, Paul M. | North, Michelle | Peng, Cheng | Sanchez-Guerra, Marco | Byun, Hyang-Min | Ellis, Anne K. | Baccarelli, Andrea A. | Okeme, Joseph O. | Dhal, Suman | Saini, Aman | Diamond, Miriam L. | Olesovsky, Christopher J. | Salter, Brittany M. | Wang, Michael | Lacy, Paige | O’Sullivan, Michael J. | Park, Chan Y. | Fredberg, Jeffrey J. | Lauzon, Anne-Marie | Martin, James G. | Ryu, Min Hyung | Mookherjee, Neeloffer | Carlsten, Christopher | Simons, Elinor | Lefebvre, Diana | Dai, David | Singh, Amrit | Shannon, Casey P. | Kim, Young Woong | Yang, Chen Xi | Mark FitzGerald, J. | Boulet, Louis-Philippe | Tebbutt, Scott J. | Singhera, Gurpreet K. | JasemineYang, S. | Dorscheid, Delbert R. | Sinnock, Hasantha | Goruk, Susan | Tavakoli, Hamid | Lynd, Larry D. | Sadatsafavi, Mohsen | Tenn, Mark W. | Thiele, Jenny | Adams, Daniel E. | Steacy, Lisa M. | Ellis, Anne K. | Torabi, Bahar | De Schryver, Sarah | Lejtenyi, Duncan | Baerg, Ingrid | Chan, Edmond S. | Mazer, Bruce D. | Tran, Maxwell M. | Dai, Wei Hao | Lou, Wendy | Chari, Radha S. | Conway, Edward M. | Neighbour, Helen | Larché, Mark | Tebbutt, Scott J
doi:10.1186/s13223-016-0164-7
PMCID: PMC5260783
12.  Prospectively measured 10-year changes in health-related quality of life and comparison with cross-sectional estimates in a population-based cohort of adult women and men 
Purpose
To prospectively assess changes in health-related quality of life (HRQOL) over 10 years, by age and sex, and to compare measured within-person change to estimates of change based on cross-sectional data.
Methods
Participants in the Canadian Multicentre Osteoporosis Study completed the 36-item short form (SF-36) in 1995/1997 and 2005/2007. Mean within-person changes for domain and summary components were calculated for men and women separately, stratified by 10-year age groups. Projected changes based on published age- and sex-stratified cross-sectional data were also calculated. Mean differences between the two methods were then estimated, along with the 95 % credible intervals of the differences.
Results
Data were available for 5,569/9,423 (59.1 %) of the original cohort. Prospectively collected 10-year changes suggested that the four physically oriented domains declined in all but the youngest group of men and women, with declines in the elderly men exceeding 25 points. The four mentally oriented domains tended to improve over time, only showing substantial declines in vitality and role emotional in older women, and all four domains in older men. Cross-sectional estimates identified a similar pattern of change but with a smaller magnitude, particularly in men. Correspondence between the two methods was generally high.
Conclusions
Changes in HRQOL may be minimal over much of the life span, but physically oriented HRQOL can decline substantially after middle age. Although clinically relevant declines were more evident in prospectively collected data, differences in 10-year age increments of cross-sectional data may be a reasonable proxy for longitudinal changes, at least in those under 65 years of age. Results provide additional insight into the natural progression of HRQOL in the general population.
doi:10.1007/s11136-014-0733-5
PMCID: PMC5112024  PMID: 24925754 CAMSID: cams6091
SF-36; Normative; Prospective; Quality of life; HRQOL
13.  Health-related Quality of Life in Canadian Adolescents and Young Adults: Normative Data Using the SF-36 
Objectives
Normative data for the SF-36 measure of health-related quality of life (HRQOL) exist for those over 25 years of age, based on data from the population-based Canadian Multicentre Osteoporosis Study (CaMos). CaMos recently recruited a sample of young Canadians aged between 16 and 24 years. The purpose of this study was to develop normative SF-36 data for this age group.
Methods
After direct standardization to the Canadian population, means, standard deviations (SD), 95% confidence intervals and percentage at floor and ceiling were produced for the eight domain and two summary scores of the SF-36. Domains are scored from 0 (poor) to 100 (excellent). Summary scores are standardized to a mean of 50, with scores over 50 representing better than average and below 50 poorer than average function. Separate analyses were completed for men and women, and for those 16–19 years and 20–24 years.
Results
The 1,001 community-based participants consisted of 474 men and 527 women from nine CaMos centres across Canada. Mean Physical Component Summary scores were 53.9 (SD=6.9) and 53.3 (SD=5.7) for young men and women, respectively. The equivalent Mental Component Summary scores were 49.3 (SD=9.7) and 48.8 (SD=8.9). In general, men scored somewhat higher than women, and younger (16–19 years) women scored higher than older (20–24 years) women, although the differences were small.
Conclusion
HRQOL is good in this cohort of young Canadians. Both men and women scored somewhat better on physically than mentally oriented domains. In general, Canadian scores were similar to those of the US, while a comparable Swedish sample scored higher than both countries on most domains. Results underscore the importance of taking country, age and gender into consideration when using normative data.
PMCID: PMC5104548  PMID: 20209739 CAMSID: cams6245
SF-36; normative; adolescents; youth; gender; CaMos; age
14.  Association Between Change in BMD and Fragility Fracture in Women and Men* 
Our objective was to estimate the relationship between longitudinal change in BMD and fragility fractures. We studied 3635 women and 1417 men 50–85 yr of age in the Canadian Multicentre Osteoporosis Study who had at least two BMD measurements (lumbar spine, femoral neck, total hip, and trochanter) within the first 5 yr of the study and fragility fractures (any, main, forearm/wrist, ribs, hip) within the first 7 yr. Multiple logistic regression was used to model the relationship between baseline BMD, BMD change, and fragility fractures. We found that, among nonusers of antiresorptives, independent of baseline BMD, a decrease of 0.01 g/cm2/yr in total hip BMD was associated with an increased risk of fragility fracture with ORs of 1.15 (95% CI: 1.01; 1.32) in women and 1.34 (95% CI: 1.02; 1.78) in men. The risk of fragility fractures in subgroups such as fast losers and those with osteopenia was better estimated by models that included BMD change than by models that included baseline BMD but excluded BMD change. Although the association between baseline BMD and fragility fractures was similar in users and nonusers of anti-resorptives, the association was stronger in nonusers compared with users. These results show that BMD change in both men and women is an independent risk factor for fragility fractures and also predicts fracture risk in those with osteopenia. The results suggest that BMD change should be included with other variables in a comprehensive fracture prediction model to capture its contribution to osteoporotic fracture risk.
doi:10.1359/jbmr.081004
PMCID: PMC5104566  PMID: 18847328 CAMSID: cams6218
fragility fracture; BMD change; longitudinal study; women; men
15.  Temporal Trends and Determinants of Longitudinal Change in 25-Hydroxyvitamin D and Parathyroid Hormone Levels 
Vitamin D is essential for facilitating calcium absorption and preventing increases in parathyroid hormone (PTH), which can augment bone resorption. Our objectives were to examine serum levels of 25-hydroxyvitamin D [25(OH)D] and PTH, and factors related to longitudinal change in a population-based cohort. This is the first longitudinal population-based study looking at PTH and 25(OH)D levels. We analyzed 3896 blood samples from 1896 women and 829 men in the Canadian Multicentre Osteoporosis Study over a 10-year period starting in 1995 to 1997. We fit hierarchical models with all available data and adjusted for season. Over 10 years, vitamin D supplement intake increased by 317 (95% confidence interval [CI] 277 to 359) IU/day in women and by 193 (135 to 252) IU/day in men. Serum 25(OH)D (without adjustment) increased by 9.3 (7.3 to 11.4) nmol/L in women and by 3.5 (0.6 to 6.4) nmol/L in men but increased by 4.7 (2.4 to 7.0) nmol/L in women and by 2.7 (−0.6 to 6.2) nmol/L in men after adjustment for vitamin D supplements. The percentage of participants with 25(OH)D levels <50 nmol/L was 29.7% (26.2 to 33.2) at baseline and 19.8% (18.0 to 21.6) at year 10 follow-up. PTH decreased over 10 years by 7.9 (5.4 to 11.3) pg/mL in women and by 4.6 (0.2 to 9.0) pg/mL in men. Higher 25(OH)D levels were associated with summer, younger age, lower body mass index (BMI), regular physical activity, sun exposure, and higher total calcium intake. Lower PTH levels were associated with younger age and higher 25(OH)D levels in both women and men and with lower BMI and participation in regular physical activity in women only. We have observed concurrent increasing 25(OH)D levels and decreasing PTH levels over 10 years. Secular increases in supplemental vitamin D intake influenced both changes in serum 25(OH)D and PTH levels.
doi:10.1002/jbmr.1587
PMCID: PMC5101062  PMID: 22407786 CAMSID: cams6152
25(OH)D; PTH; POPULATION-BASED; LONGITUDINAL; VITAMIN D SUPPLEMENT
16.  Peak Bone Mass From Longitudinal Data: Implications for the Prevalence, Pathophysiology, and Diagnosis of Osteoporosis 
We estimated peak bone mass (PBM) in 615 women and 527 men aged 16 to 40 years using longitudinal data from the Canadian Multicentre Osteoporosis Study (CaMos). Individual rates of change were averaged to find the mean rate of change for each baseline age. The age range for PBM was defined as the period during which bone mineral density (BMD) was stable. PBM was estimated via hierarchical models, weighted according to 2006 Canadian Census data. Lumbar spine PBM (1.046 ±0.123 g/cm2) occurred at ages 33 to 40 years in women and at 19 to 33 years in men (1.066 ± 0.129 g/cm2). Total hip PBM (0.981 ± 0.122 g/cm2) occurred at ages 16 to 19 years in women and 19 to 21 years in men (1.093 ± 0.169 g/cm2). Analysis of Canadian geographic variation revealed that the levels of PBM and of mean BMD in those over age 65 sometimes were discordant, suggesting that PBM and subsequent rates of bone loss may be subject to different genetic and/or environmental influences. Based on our longitudinally estimated PBM values, the estimated Canadian prevalences of osteoporosis (T-score <–2.5) were 12.0% (L1–L4) and 9.1% (total hip) in women aged 50 years and older and 2.9% (L1–L4) and 0.9% (total hip) in men aged 50 years and older. These were higher than prevalences using cross-sectional PBM data. In summary, we found that the age at which PBM is achieved varies by sex and skeletal site, and different reference values for PBM lead to different estimates of the prevalence of osteoporosis. Furthermore, lack of concordance of PBM and BMD over age 65 suggests different determinants of PBM and subsequent bone loss.
doi:10.1002/jbmr.95
PMCID: PMC5101070  PMID: 20499378 CAMSID: cams6184
PEAK BONE MASS; T-SCORES; OSTEOPOROSIS PREVALENCE; GEOGRAPHIC VARIATION; LONGITUDINAL
17.  Neighbourhood walkability and home neighbourhood-based physical activity: an observational study of adults with type 2 diabetes 
BMC Public Health  2016;16(1):957.
Background
Converging international evidence suggests that diabetes incidence is lower among adults living in more walkable neighbourhoods. The association between walkability and physical activity (PA), the presumed mediator of this relationship, has not been carefully examined in adults with type 2 diabetes. We investigated the associations of walkability with total PA occurring within home neighbourhoods and overall PA, irrespective of location.
Methods
Participants (n = 97; 59.5 ± 10.5 years) were recruited through clinics in Montreal (QC, Canada) and wore a GPS-accelerometer device for 7 days. Total PA was expressed as the total Vector of the Dynamic Body Acceleration. PA location was determined using a Global Positioning System (GPS) device (SIRF IV chip). Walkability (street connectivity, land use mix, population density) was assessed using Geographical Information Systems software. The cross-sectional associations between walkability and location-based PA were estimated using robust linear regressions adjusted for age, body mass index, sex, university education, season, car access, residential self-selection, and wear-time.
Results
A one standard deviation (SD) increment in walkability was associated with 10.4 % of a SD increment in neighbourhood-based PA (95 % confidence interval (CI) 1.2, 19.7) – equivalent to 165 more steps/day (95 % 19, 312). Car access emerged as an important predictor of neighbourhood-based PA (Not having car access: 38.6 % of a SD increment in neighbourhood-based PA, 95 % CI 17.9, 59.3). Neither walkability nor car access were conclusively associated with overall PA.
Conclusions
Higher neighbourhood walkability is associated with higher home neighbourhood-based PA but not with higher overall PA. Other factors will need to be leveraged to facilitate meaningful increases in overall PA among adults with type 2 diabetes.
Electronic supplementary material
The online version of this article (doi:10.1186/s12889-016-3603-y) contains supplementary material, which is available to authorized users.
doi:10.1186/s12889-016-3603-y
PMCID: PMC5017036  PMID: 27613233
Type 2 diabetes; Physical activity; Accelerometry; Global Positioning Systems; Physical activity locations; Neighbourhood walkability; Environmental epidemiology; Health geography
18.  Influenza Virus Detection Following Administration of Live-Attenuated Intranasal Influenza Vaccine in Children With Cystic Fibrosis and Their Healthy Siblings 
Open Forum Infectious Diseases  2016;3(4):ofw187.
Background. We aimed to explore the detection profile of influenza viruses following live-attenuated intranasal influenza vaccination (LAIV) in children aged 2–19 years with and without cystic fibrosis (CF).
Methods. Before the 2013–2014 influenza season, flocked nasal swabs were obtained before vaccination and 4 times in the week of follow-up from 76 participants (nCF: 57; nhealthy: 19). Influenza was detected by reverse transcription polymerase chain reaction (RT-PCR) assays. A Bayesian hierarchical logistic regression model was used to estimate the effect of CF status and age on influenza detection.
Results. Overall, 69% of the study cohort shed influenza RNA during follow-up. The mean duration of RT-PCR detection was 2.09 days (95% credible interval [CrI]: 1.73–2.48). The odds of influenza RNA detection on day 1 following vaccination decreased with age in years (odds ratio [OR]: 0.82 per year; 95% CrI: 0.70–0.95), and subjects with CF had higher odds of influenza RNA detection on day 1 of follow-up (OR: 5.09; 95% CrI: 1.02–29.9).
Conclusion. Despite the small sample size, our results indicate that LAIV vaccine strains are detectable during the week after LAIV, mainly in younger individuals and vaccinees with CF. It remains unclear whether recommendations for avoiding contact with severely immunocompromised patients should differ for these groups.
doi:10.1093/ofid/ofw187
PMCID: PMC5063549  PMID: 27747255
childhood vaccination; cystic fibrosis; influenza; live-attenuated influenza virus vaccine; viral detection
19.  Proceedings of the Canadian society of allergy and clinical immunology annual scientific meeting 2015 
Côté, Marie-Ève | Boulay, Marie-Ève | Plante, Sophie | Chakir, Jamila | Boulet, Louis-Philippe | Ahmed, Hanan | Ospina, Maria-Beatriz | Sideri, Kyriaki | Vliagoftis, Harissios | Johnson, Sara F. | Woodgate, Roberta L. | Cros, Guilhem | Teira, Pierre | Cellot, Sonia | Bittencourt, Henrique | Decaluwe, Helene | Vachon, Marie France | Duval, Michel | Haddad, Elie | Kim, Vy H. D. | Pham-Huy, Anne | Grunebaum, Eyal | Oliveria, John-Paul | Phan, Stephanie | Tenn, Mark W. | Tworek, Damian | Smith, Steven G. | Baatjes, Adrian J. | Obminski, Caitlin D. | Munoz, Caroline E. | Scime, Tara X. | Sehmi, Roma | Gauvreau, Gail M. | Salter, Brittany M. | Smith, Steven G. | Obminski, Caitlin D. | Munoz, Caroline E. | Schlatman, Abbey | Scime, Tara X. | Watson, Rick | Sherkat, Roya | Khoshnevisan, Razieh | Sheikhbahaei, Saba | Betschel, Stephen | Warrington, Richard | Schellenberg, Robert | Fein, Michael N. | Pelletier, Jean-Philippe | Kan, Manstein | Labrosse, Roxane | Mak, Raymond | Loh, James | Kanani, Amin | Nowak, Dominik A. | Keith, Paul K. | Pannozzo, Daniel | Lima, Hermenio C. | Pham, Diana | Pham, Hoang | Alvarez, Gonzalo G. | Bencze, Istvan T. | Sharma, Krishna B. | Smith, Mark | Aaron, Shawn | Block, Jennifer | Keays, Tara | Leech, Judith | Schneidermen, David | Cameron, Jodi | Forgie, Jennifer | Ring, Alicia | O’Quinn, John W. | Santucci, Stephanie | Yang, William H. | Gaudet, Ena | Aaron, Shawn | Voisin, Mathew R. | Borici-Mazi, Rozita | Vostretsova, Kateryna | Stark, Donald F. | Yeboah, Elizabeth | Martin-Rhee, Michelle | Gula, Cheryl | Cheng, Clare | Paltser, Geoff | Dery, Alizée | Clarke, Ann | Nadeau, Kari | Harada, Laurie | Weatherall, Kimberley | Greenwood, Celia | Daley, Denise | Asai, Yuka | Ben-Shoshan, Moshe | Ling, Ling | Ospina, Maria B. | Protudjer, Jennifer L. P. | Vetander, Mirja | van Hage, Marianne | Olén, Ola | Wickman, Magnus | Bergström, Anna | Teoh, Timothy | Mill, Christopher | Wong, Tiffany | Baerg, Ingrid | Alexander, Angela | Hildebrand, Kyla J. | Dean, John | Kuzeljevic, Boris | Chan, Edmond S. | Argeny, Jonathan | Gona-Hoepler, Mia | Fucik, Petra | Nachbaur, Edith | Gruber, Saskia | Crameri, Reto | Glaser, Andreas | Szépfalusi, Zsolt | Rhyner, Claudio | Eiwegger, Thomas | Plunkett, Greg | Mire, Brad | Yazicioglu, Mehtap | Can, Ceren | Ciplak, Gokce | Cook, Victoria E. | Portales-Casamar, Elodie | Nashi, Emil P. | Gabrielli, Sofianne | Primeau, Marie-Noel | Lejtenyi, Christine | Netchiporouk, Elena | Dery, Alizee | Shand, Greg | Hoe, Erica | Liem, Joel | Ko, Jason K. | Huang, David J. T. | Mazza, Jorge A. | McHenry, Mary | Otley, Anthony | Watson, Wade | Kraft, John N. | Paina, Mihaela | Darwish Hassan, Ahmed A. | Heroux, Delia | Crawford, Lynn | Gauvreau, Gail | Denburg, Judah | Pedder, Linda | Chad, Zave | Sussman, Gordon | Hébert, Jacques | Frankish, Charles | Olynych, Timothy | Cheema, Amarjit | Del Carpio, Jaime | Harrison, Rachel | Torabi, Bahar | Medoff, Elaine | Mill, Jennifer | Quirt, Jaclyn A. | Wen, Xia | Kim, Jonathan | Herrero, Angel Jimenez | Kim, Harold L. | Grzyb, Magdalena J. | Primeau, Marie-Noël | Azad, Meghan B. | Lu, Zihang | Becker, Allan B. | Subbarao, Padmaja | Mandhane, Piushkumar J. | Turvey, Stuart E. | Sears, Malcolm R. | Boucher-Lafleur, Anne-Marie | Gagné-Ouellet, Valérie | Jacques, Éric | Laprise, Catherine | Chen, Michael | McGovern, Toby | Adner, Mikael | Martin, James G. | Cosic, Nela | Ntanda, Henry | Giesbrecht, Gerald | Kozyrskyj, Anita | Letourneau, Nicole | Dawod, Bassel | Marshall, Jean | De Schryver, Sarah | Halbrich, Michelle | La Vieille, Sebastian | Eisman, Harley | Alizadehfar, Reza | Joseph, Lawrence | Morris, Judy | Feldman, Laura Y. | Thacher, Jesse D. | Kull, Inger | Melén, Erik | Pershagen, Göran | Protudjer, Jennifer L. P. | Hosseini, Ali | Hackett, Tillie L. | Hirota, Jeremy | McNagny, Kelly | Wilson, Susan | Carlsten, Chris | Huq, Saiful | Chooniedass, Rishma | Gerwing, Brenda | Huang, Henry | Lefebvre, Diana | Becker, Allan | Khamis, Mona M. | Awad, Hanan | Allen, Kevin | Adamko, Darryl J. | El-Aneed, Anas | Kim, Young Woong | Gliddon, Daniel R. | Shannon, Casey P. | Singh, Amrit | Hickey, Pascal L. C. | Ellis, Anne K. | Neighbour, Helen | Larche, Mark | Tebbutt, Scott J. | Ladouceur, Erika | Stewart, Miriam | Evans, Josh | Masuda, Jeff | To, Teresa | King, Malcolm | Larouche, Miriam | Liang, Liming | Legere, Stephanie A. | Haidl, Ian D. | Legaré, Jean-Francois | Marshall, Jean S. | Sears, Malcolm | Moraes, Theo J. | Ratjen, Felix | Gustafsson, Per | Lou, Wendy | North, Michelle L. | Lee, Elizabeth | Omana, Vanessa | Thiele, Jenny | Brook, Jeff | Rahman, Tanvir | Lejtenyi, Duncan | Fiter, Ryan | Piccirillo, Ciriaco | Mazer, Bruce | Simons, Elinor | Hildebrand, Kyla | Turvey, Stuart | DeMarco, Mari | Le Cao, Kim-Anh | Gauvreau, Gail M. | Mark FitzGerald, J. | O’Byrne, Paul M. | Stiemsma, Leah T. | Arrieta, Marie-Claire | Cheng, Jasmine | Dimitriu, Pedro A. | Thorson, Lisa | Yurist, Sophie | Lefebvre, Diana L. | Mandhane, Piush | McNagny, Kelly M. | Kollmann, Tobias | Mohn, William W. | Brett Finlay, B. | Tran, Maxwell M. | Lefebvre, Diana L. | Ramasundarahettige, Chinthanie F. | Dai, Wei Hao | Mandhane, Piush J. | Tworek, Damian | O’Byrne, Seamus N. | O’Byrne, Paul M. | Denburg, Judah A. | Walsh, Laura | Soliman, Mena | Steacy, Lisa M. | Adams, Daniel E. | Warner, Linda | Mauro, Mary Ann | Mamonluk, Robby | Yang, ChenXi | Conway, Ed M.
Table of contents
A1 Role of fibrocytes in allergic rhinitis
Marie-Ève Côté, Marie-Ève Boulay, Sophie Plante, Jamila Chakir, Louis-Philippe Boulet
A2 Patterns of aeroallergens sensitization in Northern Alberta
Hanan Ahmed, Maria-Beatriz Ospina, Kyriaki Sideri, Harissios Vliagoftis
A3 Addressing acceptable risk for adolescents with Food-Induced Anaphylaxis (FIA)
Sara F. Johnson, Roberta L. Woodgate
A4 Outcomes of matched related and unrelated bone marrow transplantation after reduced-toxicity conditioning for children suffering from Chronic Granulomatous Disease
Guilhem Cros, Pierre Teira, Sonia Cellot, Henrique Bittencourt, Helene Decaluwe, Marie France Vachon, Michel Duval, Elie Haddad
A5 Outcomes of patients with severe combined immunodeficiency (SCID) prior to and after initiation of newborn screening for SCID in Ontario
Vy H.D. Kim, Anne Pham-Huy, Eyal Grunebaum
A6 Detection of regulatory B cells in the airways of subjects with asthma
John-Paul Oliveria, Stephanie Phan, Mark W. Tenn, Damian Tworek, Steven G. Smith, Adrian J. Baatjes, Caitlin D. Obminski, Caroline E. Munoz, Tara X. Scime, Roma Sehmi, Gail M Gauvreau
A7 Characterization of IgE-expressing B cells in the airways and peripheral blood of allergic asthmatic subjects
John-Paul Oliveria, Stephanie Phan, Mark W. Tenn, Brittany M Salter, Steven G Smith, Caitlin D Obminski, Caroline E Munoz, Abbey Schlatman, Tara X Scime, Rick Watson, Roma Sehmi, Gail M Gauvreau
A8 Pregnancy: could it be a risk factor for primary immunodeficient patients
Roya Sherkat, Razieh Khoshnevisan, Saba Sheikhbahaei
A9 Clinical experience with Octagam: a Canadian retrospective chart review
Stephen Betschel, Richard Warrington, Robert Schellenberg
A10 Kounis syndrome secondary to contrast media with inferior ST elevations and bilateral ischemic stroke
Michael N Fein, Jean-Philippe Pelletier
A11 Honey bee venom immunotherapy ineffective in bumble bee-induced anaphylaxis: case report and review of literature
Manstein Kan, Robert Schellenberg
A12 Delayed immune reconstitution occurring after multiple immune complications of hematological stem cell transplantation for a leaky SCID
Roxane Labrosse, Guilhem Cros, Pierre Teira, Henrique Bittencourt, Helene Decaluwe, Michel Duval, Elie Haddad
A13 Comparison of Three Case Reports of Acquired Angioedema: presentation, management and outcome
Raymond Mak, James Loh, Amin Kanani
A14 Sitagliptin-associated angioedema not related to concurrent use of ARB or ACE inhibitor
Dominik A. Nowak, Paul K. Keith
A15 Sneddon-Wilkinson subcorneal pustular dermatosis associated with an IgA monoclonal gammopathy
Daniel Pannozzo, Dominik A. Nowak, Hermenio C. Lima
A16 Omalizumab can be effective in patients with allergic bronchopulmonary aspergillosis
Diana Pham, Hoang Pham, Gonzalo G. Alvarez, Istvan T. Bencze, Krishna B. Sharma, Mark Smith, Shawn Aaron, Jennifer Block, Tara Keays, Judith Leech, David Schneidermen, Jodi Cameron, Jennifer Forgie, Alicia Ring, John W. O’Quinn, Stephanie Santucci, William H. Yang
A17 Efficacious use of omalizumab in the treatment of cystic fibrosis
Diana Pham, Hoang Pham, Ena Gaudet, Shawn Aaron, Stephanie Santucci, William H. Yang
A18 HAE with normal C1-INH with inconsistent response to C1 esterase inhibitor infusion but reliably responsive to icatibant
Hoang Pham, Stephanie Santucci, William H. Yang
A19 Anaphylaxis reaction to lactase enzyme
Mathew R. Voisin, Rozita Borici-Mazi
A20 Risk of solid tumor malignancies in patients with primary immune deficiency
Kateryna Vostretsova, Donald F. Stark
A21 Is it time to adopt the chromogenic assay for measuring C1 esterase inhibitor function in patients with HAE Type 2?
Elizabeth Yeboah, Paul K. Keith
A22 Emergency department visits for anaphylaxis and allergic reactions
Michelle Martin-Rhee, Cheryl Gula, Clare Cheng, Geoff Paltser
A23 START: Susceptibility To food Allergies in a Registry of Twins
Alizée Dery, Ann Clarke, Kari Nadeau, Laurie Harada, Kimberley Weatherall, Celia Greenwood, Denise Daley, Yuka Asai, Moshe Ben-Shoshan
A24 Qualifying the diagnostic approach employed by allergists when managing patients with self-diagnosed non-celiac gluten sensitivity (NCGS)
Lee Horgan, Teresa Pun
A25 Retrospective analysis on the agreement between skin prick test and serum food specific IgE antibody in adults with suspected food allergy
Ling Ling, Maria B. Ospina, Kyriaki Sideri, Harissios Vliagoftis
A26 Staple food hypersensitivity from infancy to adolescence: a report from the BAMSE cohort
Jennifer L.P. Protudjer, Mirja Vetander, Marianne van Hage, Ola Olén, Magnus Wickman, Anna Bergström
A27 Evaluating the impact of supervised epinephrine autoinjector administration during food challenges on perceived parent confidence
Timothy Teoh, Christopher Mill, Tiffany Wong, Ingrid Baerg, Angela Alexander, Kyla J. Hildebrand, John Dean, Boris Kuzeljevic, Edmond S. Chan
A28 Local immunoglobulin production to Aspergillus fumigatus cystic fibrosis
Jonathan Argeny, Mia Gona-Hoepler, Petra Fucik, Edith Nachbaur, Saskia Gruber, Reto Crameri, Andreas Glaser, Zsolt Szépfalusi, Claudio Rhyner, Thomas Eiwegger
A29 Extract consumption with skin prick test (SPT) devices
Greg. Plunkett, Brad Mire
A30 Evaluation of our cases with nonsteroidal anti-inflammatory drug reactions
Mehtap Yazicioglu, Ceren Can, Gokce Ciplak
A31 Reasons for referral and final diagnoses in a tertiary care pediatric allergy clinic
Victoria E. Cook, Kyla J. Hildebrand, Elodie Portales-Casamar, Christopher Mill, Edmond S. Chan
A32 Internist referral practices for inpatients with self-reported penicillin allergies at a tertiary care teaching hospital
Michael N Fein, Emil P Nashi
A33 Assessing the risk of reactions in children with a negative oral challenge after a subsequent use of amoxicillin
Sofianne Gabrielli, Christopher Mill, Marie-Noel Primeau, Christine Lejtenyi, Elena Netchiporouk, Alizee Dery, Greg Shand, Moshe Ben-Shoshan
A34 Validity of self-reported penicillin allergies
Erica Hoe, Joel Liem
A35 Effectiveness of allergy-test directed elimination diets in eosinophilic esophagitis
Jason K. Ko, David J.T. Huang, Jorge A. Mazza
A36 Allergy testing and dietary management in pediatric eosinophilic esophagitis (EoE): A retrospective review of a tertiary Canadian centre’s experience
Mary McHenry, Anthony Otley,Wade Watson
A37 Visualizing the impact of atopic and allergic skin disease
Dominik A. Nowak, John N. Kraft
A38 Cystic fibrosis with and without nasal polyposis in pediatric patients: a cross-sectional comparative study
Mihaela Paina, Ahmed A. Darwish Hassan, Delia Heroux, Lynn Crawford, Gail Gauvreau, Judah Denburg, Linda Pedder, Paul K. Keith
A39 Evaluation of macrolide antibiotic hypersensitivity: the role of oral challenges in children
Bahar Torabi, Marie-Noel Primeau, Christine Lejtenyi, Elaine Medoff, Jennifer Mill, Moshe Ben-Shoshan
A40 Venom allergy testing: is a graded approach necessary?
Jaclyn A. Quirt, Xia Wen, Jonathan Kim, Angel Jimenez Herrero, Harold L. Kim
A41 The role of oral challenges in evaluating cephalosporin hypersensitivity reactions in children
Magdalena J. Grzyb, Marie-Noël Primeau, Christine Lejtenyi, Elaine Medoff, Jennifer Mill, Moshe Ben-Shoshan
A42 Breastfeeding and infant wheeze, atopy and atopic dermatitis: findings from the Canadian Healthy Infant Longitudinal Development Study
Meghan B. Azad, Zihang Lu, Allan B. Becker, Padmaja Subbarao, Piushkumar J. Mandhane, Stuart E. Turvey, Malcolm R. Sears, the CHILD Study Investigators
A43 IL33 DNA methylation in bronchial epithelial cells is associated to asthma
Anne-Marie Boucher-Lafleur, Valérie Gagné-Ouellet, Éric Jacques, Sophie Plante, Jamila Chakir, Catherine Laprise
A44 NRF2 mediates the antioxidant response to organic dust-induced oxidative stress in bronchial epithelial cells
Michael Chen, Toby McGovern, Mikael Adner, James G. Martin
A45 The effects of perinatal distress, immune biomarkers and mother-infant interaction quality on childhood atopic dermatitis (rash) at 18 months
Nela Cosic, Henry Ntanda, Gerald Giesbrecht, Anita Kozyrskyj, Nicole Letourneau
A46 Examining the immunological mechanisms associated with cow’s milk allergy
Bassel Dawod, Jean Marshall
A47 Tryptase levels in children presenting with anaphylaxis to the Montréal Children’s Hospital
Sarah De Schryver, Michelle Halbrich, Ann Clarke, Sebastian La Vieille, Harley Eisman, Reza Alizadehfar, Lawrence Joseph, Judy Morris, Moshe Ben-Shoshan
A48 Secondhand tobacco smoke exposure in infancy and the development of food hypersensitivity from childhood to adolescence
Laura Y. Feldman, Jesse D. Thacher, Inger Kull, Erik Melén, Göran Pershagen, Magnus Wickman, Jennifer L. P. Protudjer, Anna Bergström
A49 Combined exposure to diesel exhaust and allergen enhances allergic inflammation in the bronchial submucosa of atopic subjects
Ali Hosseini, Tillie L. Hackett, Jeremy Hirota, Kelly McNagny, Susan Wilson, Chris Carlsten
A50 Comparison of skin-prick test measurements by an automated system against the manual method
Saiful Huq, Rishma Chooniedass, Brenda Gerwing, Henry Huang, Diana Lefebvre, Allan Becker
A51 The accurate identification and quantification of urinary biomarkers of asthma and COPD through the use of novel DIL- LC-MS/MS methods
Mona M. Khamis, Hanan Awad, Kevin Allen, Darryl J. Adamko, Anas El-Aneed
A52 Systemic immune pathways associated with the mechanism of Cat-Synthetic Peptide Immuno-Regulatory Epitopes, a novel immunotherapy, in whole blood of cat-allergic people
Young Woong Kim, Daniel R. Gliddon, Casey P. Shannon, Amrit Singh, Pascal L. C. Hickey, Anne K. Ellis, Helen Neighbour, Mark Larche, Scott J. Tebbutt
A53 Reducing the health disparities: online support for children with asthma and allergies from low-income families
Erika Ladouceur, Miriam Stewart, Josh Evans, Jeff Masuda, Nicole Letourneau, Teresa To, Malcolm King
A54 Epigenetic association of PSORS1C1 and asthma in the Saguenay-Lac-Saint-Jean asthma study
Miriam Larouche, Liming Liang, Catherine Laprise
A55 IL-33 induces cytokine and chemokine production in human mast cells
Stephanie A. Legere, Ian D. Haidl, Jean-Francois Legaré, Jean S. Marshall
A56 Reference ranges for lung clearance index from infancy to adolescence for Canadian population
Zihang Lu, Malcolm Sears, Theo J. Moraes, Felix Ratjen, Per Gustafsson, Wendy Lou, Padmaja Subbarao
A57 Kingston Allergy Birth Cohort: cohort profile and mother/child characteristics to age 2
Michelle L. North, Elizabeth Lee, Vanessa Omana, Jenny Thiele, Jeff Brook, Anne K. Ellis
A58 Cow’s milk protein specific IgE, IgA and IgG4 as a predictor of outcome in oral immunotherapy
Tanvir Rahman, Duncan Lejtenyi, Sarah De Schryver, Ryan Fiter, Ciriaco Piccirillo, Moshe Ben-Shoshan, Bruce Mazer
A59 Age of peanut introduction and development of reactions and sensitization to peanut
Elinor Simons, Allan B. Becker, Rishma Chooniedass, Kyla Hildebrand, Edmond S. Chan, Stuart Turvey, Padmaja Subbarao, Malcolm Sears
A60 Multi-omic blood biomarker signatures of the late phase asthmatic response
Amrit Singh, Casey P. Shannon, Young Woong Kim, Mari DeMarco, Kim-Anh Le Cao, Gail M. Gauvreau, J. Mark FitzGerald, Louis-Philippe Boulet, Paul M. O’Byrne, Scott J. Tebbutt
A61 Early life gut microbial alterations in children diagnosed with asthma by three years of age
Leah T. Stiemsma, Marie-Claire Arrieta, Jasmine Cheng, Pedro A. Dimitriu, Lisa Thorson, Sophie Yurist, Boris Kuzeljevic, Diana L. Lefebvre, Padmaja Subbarao, Piush Mandhane, Allan Becker, Malcolm R. Sears, Kelly M. McNagny, Tobias Kollmann, the CHILD Study Investigators, William W. Mohn, B. Brett Finlay, Stuart E. Turvey
A62 The relationship between food sensitization and atopic dermatitis at age 1 year in a Canadian birth cohort
Maxwell M. Tran, Diana L. Lefebvre, Chinthanie F. Ramasundarahettige, Allan B. Becker, Wei Hao Dai, Padmaja Subbarao, Piush J. Mandhane, Stuart E. Turvey, Malcolm R. Sears
A63 Allergen inhalation enhances Toll-like receptor-induced thymic stromal lymphopoietin receptor expression by hematopoietic progenitor cells in mild asthmatics
Damian Tworek, Delia Heroux, Seamus N. O’Byrne, Paul M. O’Byrne, Judah A. Denburg
A64 The Allergic Rhinitis Clinical Investigator Collaborative – replicated eosinophilia on repeated cumulative allergen challenges in nasal lavage samples
Laura Walsh, Mena Soliman, Jenny Thiele, Lisa M. Steacy, Daniel E. Adams, Anne K. Ellis
A65 The CHILD Study: optimizing subject retention in pediatric longitudinal cohort research
Linda Warner, Mary Ann Mauro, Robby Mamonluk, Stuart E. Turvey
A66 Differential expression of C3a and C5a in allergic asthma
ChenXi Yang, Amrit Singh, Casey P. Shannon, Young Woong Kim, Ed M. Conway, Scott J. Tebbutt
doi:10.1186/s13223-016-0118-0
PMCID: PMC5009563
20.  Fine particulate air pollution, nitrogen dioxide, and systemic autoimmune rheumatic disease in Calgary, Alberta 
Environmental research  2015;140:474-478.
Objective
To estimate the association between fine particulate (PM2.5) and nitrogen dioxide (NO2) pollution and systemic autoimmune rheumatic diseases (SARDs).
Methods
Associations between ambient air pollution (PM2.5 and NO2) and SARDs were assessed using land-use regression models for Calgary, Alberta and administrative health data (1993-2007). SARD case definitions were based on ≥2 physician claims, or ≥1 rheumatology billing code; or ≥1 hospitalization code (for systemic lupus, Sjogren's Syndrome, scleroderma, polymyositis, dermatomyositis, or undifferentiated connective tissue disease). Bayesian hierarchical latent class regression models estimated the probability that each resident was a SARD case, based on these case definitions. The sum of individual level probabilities provided the estimated number of cases in each area. The latent class model included terms for age, sex, and an interaction term between age and sex. Bayesian logistic regression models were used to generate adjusted odds ratios (OR) for NO2 and PM2.5. pollutant models, adjusting for neighborhood income, age, sex, and an interaction between age and sex. We also examined models stratified for First-Nations (FN) and non-FN subgroups.
Results
Residents that were female and/or aged > 45 had a greater probability of being a SARD case, with the highest OR estimates for older females. Independently, the odds of being a SARDs case increased with PM2.5 levels, but the results were inconclusive for NO2. The results stratified by FN and Non-FN groups were not distinctly different.
Conclusion
In this urban Canadian sample, adjusting for demographics, exposure to PM2.5 was associated with an increased risk of SARDs. The results for NO2 were inconclusive.
doi:10.1016/j.envres.2015.05.007
PMCID: PMC4492844  PMID: 25988990
Systemic autoimmune rheumatic diseases; air pollution
21.  Neighbourhood Walkability and Daily Steps in Adults with Type 2 Diabetes 
PLoS ONE  2016;11(3):e0151544.
Introduction
There is evidence that greater neighbourhood walkability (i.e., neighbourhoods with more amenities and well-connected streets) is associated with higher levels of total walking in Europe and in Asia, but it remains unclear if this association holds in the Canadian context and in chronic disease populations. We examined the relationships of different walkability measures to biosensor-assessed total walking (i.e., steps/day) in adults with type 2 diabetes living in Montreal (QC, Canada).
Materials and Methods
Participants (60.5±10.4 years; 48.1% women) were recruited through McGill University-affiliated clinics (June 2006 to May 2008). Steps/day were assessed once per season for one year with pedometers. Neighbourhood walkability was evaluated through participant reports, in-field audits, Geographic Information Systems (GIS)-derived measures, and the Walk Score®. Relationships between walkability and daily steps were estimated using Bayesian longitudinal hierarchical linear regression models (n = 131).
Results
Participants who reported living in the most compared to the least walkable neighbourhoods completed 1345 more steps/day (95% Credible Interval: 718, 1976; Quartiles 4 versus 1). Those living in the most compared to the least walkable neighbourhoods (based on GIS-derived walkability) completed 606 more steps per day (95% CrI: 8, 1203). No statistically significant associations with steps were observed for audit-assessed walkability or the Walk Score®.
Conclusions
Adults with type 2 diabetes who perceived their neighbourhoods as more walkable accumulated more daily steps. This suggests that knowledge of local neighborhood features that enhance walking is a meaningful predictor of higher levels of walking and an important component of neighbourhood walkability.
doi:10.1371/journal.pone.0151544
PMCID: PMC4798718  PMID: 26991308
22.  Evaluation of a Rapid Point of Care Test for Detecting Acute and Established HIV Infection, and Examining the Role of Study Quality on Diagnostic Accuracy: A Bayesian Meta-Analysis 
PLoS ONE  2016;11(2):e0149592.
Introduction
Fourth generation (Ag/Ab combination) point of care HIV tests like the FDA-approved Determine HIV1/2 Ag/Ab Combo test offer the promise of timely detection of acute HIV infection, relevant in the context of HIV control. However, a synthesis of their performance has not yet been done. In this meta-analysis we not only assessed device performance but also evaluated the role of study quality on diagnostic accuracy.
Methods
Two independent reviewers searched seven databases, including conferences and bibliographies, and independently extracted data from 17 studies. Study quality was assessed with QUADAS-2. Data on sensitivity and specificity (overall, antigen, and antibody) were pooled using a Bayesian hierarchical random effects meta-analysis model. Subgroups were analyzed by blood samples (serum/plasma vs. whole blood) and study designs (case-control vs. cross-sectional).
Results
The overall specificity of the Determine Combo test was 99.1%, 95% credible interval (CrI) [97.3–99.8]. The overall pooled sensitivity for the device was at 88.5%, 95% [80.1–93.4]. When the components of the test were analyzed separately, the pooled specificities were 99.7%, 95% CrI [96.8–100] and 99.6%, 95% CrI [99.0–99.8], for the antigen and antibody components, respectively. Pooled sensitivity of the antibody component was 97.3%, 95% CrI [60.7–99.9], and pooled sensitivity for the antigen component was found to be 12.3%, 95% (CrI) [1.1–44.2]. No significant differences were found between subgroups by blood sample or study design. However, it was noted that many studies restricted their study sample to p24 antigen or RNA positive specimens, which may have led to underestimation of overall test performance. Detection bias, selection (spectrum) bias, incorporation bias, and verification bias impaired study quality.
Conclusions
Although the specificity of all test components was high, antigenic sensitivity will merit from an improvement. Besides the accuracy of the device itself, study quality, also impacts the performance of the test. These factors must be kept in mind in future evaluations of an improved device, relevant for global scale up and implementation.
doi:10.1371/journal.pone.0149592
PMCID: PMC4758636  PMID: 26891218
23.  Adenoma detection rates decline with increasing procedural hours in an endoscopist’s workload 
Opportunistic screening colonoscopy has, in part, been credited with the decline in the incidence and mortality associated with colorectal cancer. This, in turn, has substantiated the significant efforts of regulatory bodies and gastroenterology societies in promoting improvements in colonoscopy performance and resource allocation to mitigate the economic and health care burdens of colorectal cancer. However, there are some jurisdictions where benchmarks for key quality indicators remain either unmet or are less than suboptimal. Accordingly, this study investigated the impact of several factors, including operator fatigue, on adenoma detection rate, a key colonoscopy metric.
BACKGROUND:
Operator fatigue may negatively influence adenoma detection (AD) during screening colonoscopy.
OBJECTIVE:
To better characterize factors affecting AD, including the number of hours worked, and the number and type of procedures performed before an index screening colonoscopy.
METHODS:
A retrospective cohort study was conducted involving individuals undergoing a screening colonoscopy at a major tertiary care hospital in Montreal, Quebec. Individuals were identified using an endoscopic reporting database; AD was identified by an electronic chart review. A hierarchical logistic regression analysis was performed to determine the association between patient- and endoscopist-related variables and AD.
RESULTS:
A total of 430 consecutive colonoscopies performed by 10 gastroenterologists and two surgeons were included. Patient mean (± SD) age was 63.4±10.9 years, 56.3% were males, 27.7% had undergone a previous colonoscopy and the cecal intubation rate was 95.7%. The overall AD rate was 25.7%. Age was associated with AD (OR 1.06 [95% CI 1.03 to 1.08]), while female sex (OR 0.44 [95% CI 0.25 to 0.75]), an indication for average-risk screening (OR 0.47 [95% CI 0.27 to 0.80]) and an increase in the number of hours during which endoscopies were performed before the index colonoscopy (OR 0.87 [95% CI 0.76 to 0.99]) were associated with lower AD rates. On exploratory univariable analysis, a threshold of 3 h of endoscopy time performed before the index colonoscopy was associated with decreased AD.
CONCLUSION:
The number of hours devoted to endoscopies before the index colonoscopy was inversely associated with AD rate, with decreased performance possibly as early as within 3 h. This metric should be confirmed in future studies and considered when optimizing scheduling practices.
PMCID: PMC4578453  PMID: 25996612
Adenoma detection; Endoscopy workload; Screening colonoscopy
24.  Neighbourhood walkability, daily steps and utilitarian walking in Canadian adults 
BMJ Open  2015;5(11):e008964.
Objectives
To estimate the associations of neighbourhood walkability (based on Geographic Information System (GIS)-derived measures of street connectivity, land use mix, and population density and the Walk Score) with self-reported utilitarian walking and accelerometer-assessed daily steps in Canadian adults.
Design
A cross-sectional analysis of data collected as part of the Canadian Health Measures Survey (2007–2009).
Setting
Home neighbourhoods (500 m polygonal street network buffers around the centroid of the participant's postal code) located in Atlantic Canada, Québec, Ontario, the Prairies and British Columbia.
Participants
5605 individuals participated in the survey. 3727 adults (≥18 years) completed a computer-assisted interview and attended a mobile clinic assessment. Analyses were based on those who had complete exposure, outcome and covariate data (n=2949).
Main exposure measures
GIS-derived walkability (based on land use mix, street connectivity and population density); Walk Score.
Main outcome measures
Self-reported utilitarian walking; accelerometer-assessed daily steps.
Results
No important relationship was observed between neighbourhood walkability and daily steps. Participants who reported more utilitarian walking, however, accumulated more steps (<1 h/week: 6613 steps/day, 95% CI 6251 to 6975; 1 to 5 h/week: 6768 steps/day, 95% CI 6420 to 7117; ≥6 h/week: 7391 steps/day, 95% CI 6972 to 7811). There was a positive graded association between walkability and odds of walking ≥1 h/week for utilitarian purposes (eg, Q4 vs Q1 of GIS-derived walkability: OR=1.66, 95% CI 1.31 to 2.11; Q3 vs Q1: OR=1.41, 95% CI 1.14 to 1.76; Q2 vs Q1: OR=1.13, 95% CI 0.91 to 1.39) independent of age, sex, body mass index, married/common law status, annual household income, having children in the household, immigrant status, mood disorder, perceived health, ever smoker and season.
Conclusions
Contrary to expectations, living in more walkable Canadian neighbourhoods was not associated with more total walking. Utilitarian walking and daily steps were, however, correlated and walkability demonstrated a positive graded relationship with utilitarian walking.
doi:10.1136/bmjopen-2015-008964
PMCID: PMC4679838  PMID: 26603246
EPIDEMIOLOGY; PUBLIC HEALTH; PREVENTIVE MEDICINE
25.  Correlates of sitting time in adults with type 2 diabetes 
BMC Public Health  2015;15:793.
Background
Studies suggest a relationship between sitting time and cardiovascular disease mortality. Our aim was to identify socio-demographic, contextual, and clinical (e.g., body composition, diabetes duration) correlates of self-reported sitting time among adults with type 2 diabetes, a clinical population at high risk for cardiovascular disease. We sought to determine if there was an inverse relationship between sitting and step counts in a diabetes cohort in whom we had previously identified low step counts with further lowering in fall/winter.
Methods
The cohort included 198 adults (54 % men; age 60.0 SD 11.5 years; Body mass index 30.4 SD 5.6 kg/m2) (Montréal, Canada). Socio-demographic, contextual and clinical factors were assessed using standardized questionnaires and step counts with a pedometer over 14 days (concealed viewing windows). Total sitting time was estimated once per season (up to 4 times per year at –month intervals) using the International Physical Activity Questionnaire-Short version. Potential sitting time correlates were evaluated using Bayesian longitudinal hierarchical linear regression models in participants with sitting time data (n = 191).
Results
The average sitting time was 308 (SD 161) minutes/day without variation across seasons. Sitting time correlates were being an immigrant (56 fewer minutes/day spent sitting compared to non- immigrants, 95 % credible interval, CrI: −100, −11) and having a university degree (55 more minutes/day spent sitting compared to those without a university degree, 95 % CrI: 10, 100) after adjustment for potential correlates observed in univariate analyses (sex, age, job status, waist circumference, depressed mood, steps). Correlation between sitting and steps, adjusted for age and sex, was −0.144 (95 % CI: −0.280, 0.002).
Conclusion
There was low correlation between sitting time and step counts. Therefore, high sitting time and low step counts are behaviours that may need to be independently targeted. Interventions to reduce sitting time in adults with type 2 diabetes may need to target non-immigrants and those with a university degree.
doi:10.1186/s12889-015-2086-6
PMCID: PMC4541749  PMID: 26285581
Sedentary behaviors; Seasons; Steps; Socio-demographic factors

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