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1.  Elective Induction of Labor at Term Compared With Expectant Management 
Obstetrics and gynecology  2013;122(4):761-769.
OBJECTIVE
To test the association of elective induction of labor at term compared with expectant management and maternal and neonatal outcomes.
METHODS
This was a retrospective cohort study of all deliveries without prior cesarean delivery in California in 2006 using linked hospital discharge and vital statistics data. We compared elective induction at each term gestational age (37–40 weeks) as defined by The Joint Commission with expectant management in vertex, non-anomalous, singleton deliveries. We used multivariable logistic regression to test the association of elective induction and cesarean delivery, operative vaginal delivery, maternal third- or fourth-degree lacerations, perinatal death, neonatal intensive care unit admission, respiratory distress, shoulder dystocia, hyperbilirubinemia, and macrosomia (birth weight greater than 4,000 g) at each gestational week, stratified by parity.
RESULTS
The cesarean delivery rate was 16%, perinatal mortality was 0.2%, and neonatal intensive care unit admission was 6.2% (N=362,154). The odds of cesarean delivery were lower among women with elective induction compared with expectant management across all gestational ages and parity (37 weeks [odds ratio (OR) 0.44, 95% confidence interval (CI) 0.34–0.57], 38 weeks [OR 0.43, 95% CI 0.38–0.50], 39 weeks [OR 0.46, 95% CI 0.41–0.52], 40 weeks [OR 0.57, CI 0.50–0.65]). Elective induction was not associated with increased odds of severe lacerations, operative vaginal delivery, perinatal death, neonatal intensive care unit admission, respiratory distress, shoulder dystocia, or macrosomia at any term gestational age. Elective induction was associated with increased odds of hyperbilirubinemia at 37 and 38 weeks of gestation and shoulder dystocia at 39 weeks of gestation.
CONCLUSION
Elective induction of labor is associated with decreased odds of cesarean delivery when compared with expectant management
doi:10.1097/AOG.0b013e3182a6a4d0
PMCID: PMC3905733  PMID: 24084532
2.  The Effect of Maternal Body Mass Index on Perinatal Outcomes in Women with Diabetes 
American journal of perinatology  2013;31(3):249-256.
Objective
To determine the effect of increasing maternal obesity, including superobesity (body mass index [BMI] ≥ 50 kg/m2), on perinatal outcomes in women with diabetes.
Study Design
Retrospective cohort study of birth records for all live-born nonanom-alous singleton infants ≥ 37 weeks’ gestation born to Missouri residents with diabetes from 2000 to 2006. Women with either pregestational or gestational diabetes were included.
Results
There were 14,595 births to women with diabetes meeting study criteria, including 7,082 women with a BMI > 30 kg/m2 (48.5%). Compared with normal-weight women with diabetes, increasing BMI category, especially superobesity, was associated with a significantly increased risk for preeclampsia (adjusted relative risk [aRR] 3.6, 95% confidence interval [CI] 2.5, 5.2) and macrosomia (aRR 3.0, 95% CI 1.8, 5.40). The majority of nulliparous obese women with diabetes delivered via cesarean including 50.5% of obese, 61.4% of morbidly obese, and 69.8% of superobese women. The incidence of primary elective cesarean among nulliparous women with diabetes increased significantly with increasing maternal BMI with over 33% of morbidly obese and 39% of superobese women with diabetes delivering electively by cesarean.
Conclusion
Increasing maternal obesity in women with diabetes is significantly associated with higher risks of perinatal complications, especially cesarean delivery.
doi:10.1055/s-0033-1347363
PMCID: PMC3852172  PMID: 23696430
cesarean; diabetes; obesity; superobesity
3.  Racial disparities in pregnancy outcomes in obese women 
Objective
To estimate the effect of race on perinatal outcomes in obese women.
Methods
Retrospective cohort study of birth records linked to hospital discharge data for all live born singleton infants ≥37 weeks gestation born to African-American or Caucasian Missouri residents from 2000 to 2006. We excluded major congenital anomalies and women with diabetes or chronic hypertension. Obesity was defined as pre-pregnancy body mass index ≥30 kg/m2.
Results
There were 312 412 births meeting study criteria. 27.1% (11 776) of African-American mothers and 19.1% (49 415) of Caucasian mothers were obese. There were no differences in cesarean delivery or preeclampsia between obese African-American and obese Caucasian women. Infants of obese African-American women were significantly less likely to be macrosomic (0.9% vs. 2.2%, adjusted odds ratio [aOR] 0.5, 95% confidence interval [CI] 0.4 0.6) and more likely to be low birth weight (3.4% vs. 1.8%, aOR 1.9, 95% CI 1.7, 2.2) compared to infants of obese Caucasian women. Compared to their normal weight peers, obese Caucasian women had a greater relative risk of developing preeclampsia (aOR 3.1, 95% CI 2.9, 3.2) than obese African-American women (aOR 2.1, 95% CI 1.9, 2.4).
Conclusion
Racial disparities impact obesity-related maternal and neonatal complications of pregnancy.
doi:10.3109/14767058.2013.806478
PMCID: PMC3864564  PMID: 23682611
Obesity; perinatal outcomes; race; racial disparities
4.  Obesity Trends and Perinatal Outcomes in Black and White Teenagers 
Objective
Our objective was to explore the trends in prepregnancy BMI for Black and White teenagers over time and the association between elevated BMI and outcomes based on race.
Study Design
This was a retrospective cohort study of singleton infants (n=38,158) born to Black (34%) and White teenagers (< 18 years of age). We determined the prevalence of elevated prepregnancy BMI between 1993 and 2006 and the association between elevated prepregnancy BMI (primary exposure) and maternal and perinatal outcomes based on race (2000–2006).
Results
The percent of White teenagers with elevated prepregnancy BMI increased significantly from 17% to 26%. White and Black overweight and obese teenagers were more likely to have pregnancy-related hypertension than normal weight teenagers while postpartum hemorrhage was only increased in obese Black teenagers and infant complications only in overweight and obese White teenagers.
Conclusion
As the percent of elevated prepregnancy BMI has increased in White teenagers, specific risks for poor maternal and perinatal outcomes in the overweight and obese teenagers varies by race.
doi:10.1016/j.ajog.2012.09.023
PMCID: PMC3569854  PMID: 23174388
Adolescents; Obesity; Outcomes
5.  The Association Between Hospital Obstetric Volume and Perinatal Outcomes in California 
Objective
To analyze the association between hospital obstetric volume and perinatal outcomes in California.
Study Design
This was a retrospective cohort study of births occurring in California in 2006. Hospitals were divided into four obstetric volume categories. Unadjusted rates of neonatal mortality and birth asphyxia were calculated for each category, overall and among term deliveries with birthweight >2500g. Multivariable logistic regression was used to control for confounders. Deliveries in rural hospitals were analyzed separately using different volume categories.
Results
Prevalence of asphyxia increased with decreasing hospital volume overall and among term, non-low-birthweight infants, from 9 per 10,000 live births at highest-volume hospitals to 18/10,000 live births at the lowest-volume hospitals (p<0.001). Similar trends were observed in rural hospitals, with rates increasing from 7 to 34 per 10,000 live births in low-volume rural hospitals (p<0.001).
Conclusion
These findings provide evidence for an inverse association between hospital obstetric volume and birth asphyxia.
doi:10.1016/j.ajog.2012.09.029
PMCID: PMC3516613  PMID: 23174387
Asphyxia; health facility size; healthcare systems; neonatal mortality
6.  The Effect of Race/Ethnicity on Adverse Perinatal Outcomes among Patients with Gestational Diabetes 
OBJECTIVE
To determine racial/ethnic differences in perinatal outcomes among women with gestational diabetes mellitus (GDM).
STUDY DESIGN
Retrospective cohort study of 32,193 singleton births among GDMs in California from 2006, using Vital Statistics Birth and Death Certificate and Patient Discharge Data. Women were divided by race/ethnicity: White, Black, Hispanic, or Asian. Multivariable logistic regression analyzed associations between race/ethnicity and adverse outcomes, controlling for potential confounders. Outcomes included: primary cesarean, preeclampisa, neonatal hypoglycemia, preterm delivery, macrosomia, fetal anomaly, respiratory distress syndrome (RDS).
RESULTS
Compared to other races, Black women had higher odds of preeclampsia [aOR=1.57, 95%CI(1.47-1.95)], neonatal hypoglycemia [aOR=1.79, 95%CI(1.07-3.00)], and preterm delivery <37 weeks [aOR=1.56, 95%CI(1.33-1.83)]. Asians had the lowest odds of primary cesarean [aOR=0.75, 95%CI(0.69-0.82)], large for gestational age infants [aOR=0.40, 95%CI(0.33-0.48)], and neonatal RDS [aOR=0.54, 95%CI(0.40-0.73)].
CONCLUSION
Perinatal outcomes among women with GDM differ by race/ethnicity and may be attributed to inherent sociocultural differences that may impact glycemic control, the development of chronic co-morbidities, genetic variability, and variation in access to as well as quantity and quality of prenatal care.
doi:10.1016/j.ajog.2012.06.049
PMCID: PMC3462223  PMID: 22818875
Gestational Diabetes; Perinatal Outcomes; Race/Ethnicity
7.  Effect of revised IOM weight gain guidelines on perinatal outcomes 
Objective
We sought to examine perinatal outcomes in women with a body mass index (BMI) of 25 kg/m2 comparing those whose weight gain met 2009 IOM guidelines to women meeting 1990 IOM guidelines.
Methods
This is a retrospective cohort study utilizing birth records linked to hospital discharge data for all term, singleton infants born to overweight, Missouri residents (2000–2006) with a BMI of 25 kg/m2. We excluded congenital anomalies, mothers with diabetes, hypertension, or previous cesarean delivery.
Results
Fourteen thousand nine hundred fifty-five women gained 25–35 lbs (1990 guidelines); 1.6% delivered low birth weight (LBW) infants and 1.1% delivered macrosomic infants. Eight thousand three hundred fifty women gained 15–25 lbs (2009 guidelines); 3.4% delivered LBW infants and 0.6% delivered macrosomic infants. Women who gained 15–25 lbs were 1.99 (95% CI 1.67, 2.38) times more likely to have a LBW infant and 0.59 (95% CI 0.40, 0.76) times less likely to deliver a macrosomic infant.
Conclusion
Limiting weight gain in women with a BMI of 25 kg/m2, per the 2009 guidelines, increases the risk of LBW deliveries and decreases the risk of macrosomia but does not reduce associated adverse perinatal outcomes. Further studies should explore the optimal weight gain to reduce these outcomes.
doi:10.3109/14767058.2010.497883
PMCID: PMC3771357  PMID: 20593973
Gestational weight gain; infant outcomes
8.  Clinical utility and cost of non-invasive prenatal testing with cfDNA analysis in high-risk women based on a US population 
Objective
Evaluate the clinical and economic consequences of fetal trisomy 21 (T21) screening with non-invasive prenatal testing (NIPT) in high-risk pregnant women.
Methods
Using a decision-analytic model, we estimated the number of T21 cases detected, the number of invasive procedures performed, corresponding euploid fetal losses and total costs for three screening strategies: first trimester combined screening (FTS), integrated screening (INT) or NIPT, whereby NIPT was performed in high-risk patients (women 35 years or older or women with a positive conventional screening test). Modeling was based on a 4 million pregnant women cohort in the US.
Results
NIPT, at a base case price of $795, was more clinically effective and less costly (dominant) over both FTS and INT. NIPT detected 4823 T21 cases based on 5330 invasive procedures. FTS detected 3364 T21 cases based on 108 364 procedures and INT detected 3760 cases based on 108 760 procedures. NIPT detected 28% and 43% more T21 cases compared to INT and FTS, respectively, while reducing invasive procedures by >95% and reducing euploid fetal losses by >99%. Total costs were $3786M with FTS, $3919M with INT and $3403M with NIPT.
Conclusions
NIPT leads to improved T21 detection and reduction in euploid fetal loss at lower total healthcare expenditures.
doi:10.3109/14767058.2013.770464
PMCID: PMC3741020  PMID: 23356557
Aneuploidy screening; cell-free DNA; cost-effectiveness; Down syndrome; non-invasive prenatal testing; trisomy 21
9.  The impact of chronic hypertension and pregestational diabetes on pregnancy outcomes 
OBJECTIVE
The objective of the study was to examine the impact of chronic hypertension and pregestational diabetes on pregnancy outcomes.
STUDY DESIGN
This was a retrospective cohort study of 532,088 women undergoing singleton births in California in 2006. Women were categorized into chronic hypertension, pregestational diabetes, both, or neither. Pregnancy outcomes were compared using the χ2 test and multivariable logistic regression to control for potential confounders.
RESULTS
We identified differences in perinatal outcomes between the groups. The rate of preterm birth in women with both conditions was 35.5% versus 25.5% in women with chronic hypertension versus 19.4% in women with pregestational diabetes (P < .001). The rate of small for gestational age was 18.2% in women with both versus 18.3% in women with chronic hypertension versus 9.7% in women with pre-gestational diabetes (P <.001).
CONCLUSION
The impact of having both chronic hypertension and pregestational diabetes in pregnancy varies, depending on the outcome examined. Although some had an additive effect (eg, stillbirth), others did not (eg, preeclampsia).
doi:10.1016/j.ajog.2012.06.066
PMCID: PMC3724349  PMID: 22892187
chronic hypertension; perinatal outcomes; pregestational diabetes
10.  The risk of intrauterine fetal death in the small-for-gestational-age fetus 
OBJECTIVE
We sought to evaluate the risk of intrauterine fetal death (IUFD) in small-for-gestational-age (SGA) fetuses.
STUDY DESIGN
We analyzed a retrospective cohort of all births in the United States in 2005, as recorded in a national database. We calculated the risk of IUFD within 3 sets of SGA threshold categories as well as within non-SGA pregnancies using the number of at-risk fetuses as the denominator.
RESULTS
The risk of IUFD increased with gestational age and was inversely proportional to percentile of birthweight for gestational age. The risk for IUFD in those <3rd percentile was as high as 58.0 IUFDs per 10,000 at-risk fetuses, 43.9 for <5th percentile, and 26.3 for <10th percentile compared to 5.1 for non-SGA gestations.
CONCLUSION
There is an increase in the risk of IUFD in SGA fetuses compared to non-SGA fetuses at all gestational ages with the greatest risk demonstrated in the lowest percentile cohort evaluated.
doi:10.1016/j.ajog.2012.06.039
PMCID: PMC3724359  PMID: 23021697
birthweight; fetal death; small for gestational age; stillbirth
11.  Risk of Stillbirth and Infant Death Stratified by Gestational Age 
Obstetrics and gynecology  2012;120(1):76-82.
OBJECTIVE
To estimate the multiple dimensions of risk faced by pregnant women and their health care providers when comparing the risks of stillbirth at term with the risk of infant death after birth.
METHODS
This is a retrospective cohort study that included all nonanomalous, term deliveries in the state of California from 1997 to 2006 (N=3,820,826). The study compared infant mortality rates after delivery at each week of term pregnancy with the rates of a composite fetal–infant mortality that would occur after expectant management for 1 additional week.
RESULTS
The risk of stillbirth at term increases with gestational age from 2.1 per 10,000 ongoing pregnancies at 37 weeks of gestation up to 10.8 per 10,000 ongoing pregnancies at 42 weeks of gestation. At 38 weeks of gestation, the risk of expectant management carries a similar risk of death as delivery, but at each later gestational age, the mortality risk of expectant management is higher than the risk of delivery (39 weeks of gestation: 12.9 compared with 8.8 per 10,000; 40 weeks of gestation: 14.9 compared with 9.5 per 10,000; 41 weeks of gestation: 17.6 compared with 10.8 per 10,000).
CONCLUSION
Infant mortality rates at 39, 40, and 41 weeks of gestation are lower than the overall mortality risk of expectant management for 1 week.
doi:10.1097/AOG.0b013e31825bd286
PMCID: PMC3719843  PMID: 22914394
12.  Induction of labor compared to expectant management in low-risk women and associated perinatal outcomes 
OBJECTIVE
We sought to examine the association of labor induction and perinatal outcomes.
STUDY DESIGN
This was a retrospective cohort study of low-risk nulliparous women with term, live births. Women who had induction at a given gestational age (eg, 39 weeks) were compared to delivery at a later gestation (eg, 40, 41, or 42 weeks).
RESULTS
Compared to delivery at a later gestational age, those induced at 39 weeks had a lower risk of cesarean (adjusted odds ratio [aOR], 0.90; 95% confidence interval [CI], 0.88–0.91) and labor dystocia (aOR, 0.88; 95% CI, 0.84–0.94). Their neonates had lowered risk of having 5-minute Apgar <7 (aOR, 0.81; 95% CI, 0.72–0.92), meconium aspiration syndrome (aOR, 0.30; 95% CI, 0.19–0.48), and admission to neonatal intensive care unit (aOR, 0.87; 95% CI, 0.78–0.97). Similar findings were seen for women who were induced at 40 weeks compared to delivery later.
CONCLUSION
Induction of labor in low-risk women at term is not associated with increased risk of cesarean delivery compared to delivery later.
doi:10.1016/j.ajog.2012.09.019
PMCID: PMC3719847  PMID: 23063017
cesarean; induction; neonatal outcomes
13.  The Association between Body Mass Index and Gestational Diabetes Mellitus Varies by Race/Ethnicity 
American journal of perinatology  2011;28(7):515-520.
We examined body mass index (BMI) as a screening tool for gestational diabetes (GDM) and its sensitivity among different racial/ethnic groups. In a retrospective cohort study of 24,324 pregnant women at University of California, San Francisco, BMI was explored as a screening tool for GDM and was stratified by race/ethnicity. Sensitivity and specificity were examined using chi-square test and receiver-operator characteristic curves. BMI of ≥25.0 kg/m2 as a screening threshold identified GDM in >76% of African-Americans, 58% of Latinas, and 46% of Caucasians, but only 25% of Asians (p<0.001). Controlling for confounders and comparing to a BMI of ≤25, African-Americans had the greatest increased risk of GDM (adjusted odds ratio [AOR] 5.1, 95% confidence interval [CI]: 3.0 to 8.5), followed by Caucasians (AOR 3.6, 95% CI: 2.7 to 4.8), Latinas (AOR 2.7, 95% CI: 1.9 to 3.8), and Asians (AOR 2.3, 95% CI: 1.8 to 3.0). BMI’s screening characteristics to predict GDM varied by race/ethnicity. BMI can be used to counsel regarding the risk of developing GDM, but alone it is not a good screening tool.
doi:10.1055/s-0031-1272968
PMCID: PMC3666587  PMID: 21404165
Body mass index; gestational diabetes mellitus; glucose loading test; race/ethnicity; receiver-operator characteristic curve
14.  Maternal superobesity and perinatal outcomes 
OBJECTIVE
The purpose of this study was to determine the effect of maternal superobesity (body mass index [BMI], ≥50 kg/m2) compared with morbid obesity (BMI, 40–49.9 kg/m2) or obesity (BMI, 30–39.9 kg/m2) on perinatal outcomes.
STUDY DESIGN
We conducted a retrospective cohort study of birth records that were linked to hospital discharge data for all liveborn singleton term infants who were born to obese Missouri residents from 2000–2006. We excluded major congenital anomalies and women with diabetes mellitus or chronic hypertension.
RESULTS
There were 64,272 births that met the study criteria, which included 1185 superobese mothers (1.8%). Superobese women were significantly more likely than obese women to have preeclampsia (adjusted relative risk [aRR], 1.7; 95% confidence interval [CI], 1.4 –2.1), macrosomia (aRR, 1.8; 95% CI, 1.3–2.5), and cesarean delivery (aRR, 1.8; 95% CI, 1.5–2.1). Almost one-half of all superobese women (49.1%) delivered by cesarean section, and 33.8% of superobese nulliparous women underwent scheduled primary cesarean delivery.
CONCLUSION
Women with a BMI of ≥50 kg/m2 are at significantly increased risk for perinatal complications compared with obese women with a lower BMI.
doi:10.1016/j.ajog.2012.02.037
PMCID: PMC3516385  PMID: 22542116
pregnancy outcome; superobesity
15.  The Risk of Stillbirth and Infant Death Stratified by Gestational Age in Women with Gestational Diabetes 
Objective
To compare the different mortality risks between delivery and expectant management in women with gestational diabetes mellitus (GDM).
Study Design
This is a retrospective cohort study that included singleton pregnancies of women diagnosed with GDM delivering at 36-42 weeks gestational age (GA) in California from 1997-2006. A composite mortality rate was developed to estimate the risk of expectant management at each GA incorporating the stillbirth risk during the week of continuing pregnancy plus the infant mortality risk at the GA one week hence.
Results
In women with GDM, the risk of expectant management is lower than the risk of delivery at 36 weeks, (17.4 vs. 19.3 per 10,000), but at 39 weeks, the risk of expectant management exceeds that of delivery (RR 1.8, 95% CI: 1.2 – 2.6).
Conclusion
In women with GDM, infant mortality rates at 39 weeks are lower than the overall mortality risk of expectant management for one week absolute risks of stillbirth and infant death are low.
doi:10.1016/j.ajog.2012.01.014
PMCID: PMC3403365  PMID: 22464068
expectant management; gestational diabetes; infant mortality; stillbirth
16.  Perinatal morbidity associated with late preterm deliveries compared to deliveries between 37–40 weeks 
Bjog  2011;118(12):1446-1454.
Objective
To estimate the risk of short-term complications in neonates born between 34 and 36 weeks by week of gestation.
Design
This is a retrospective cohort study.
Setting
Deliveries in 2005 in the United States of America.
Population
Singleton live births between 34 and 40 weeks gestational age.
Methods
Gestational age was subgrouped into 34, 35, 36 and 37–40 completed weeks. Statistical comparisons were performed using chi-square test and multivariable logistic regression models, with 37–40 weeks gestational age designated as referent.
Main Outcome Measures
Perinatal morbidities, including 5-minute Apgar scores, hyaline membrane disease, neonatal sepsis/antibiotics use, and admission to the intensive care unit.
Results
There were 175,112 neonates born between 34 and 36 weeks in 2005. Compared to neonates born between 37 and 40 weeks, neonates born at 34 weeks had higher odds of 5-minute Apgar<7 (adjusted odds ratio [aOR]=5.51, 95% CI [5.16–5.88]), hyaline membranes disease (aOR=10.2 [9.44–10.9]), mechanical ventilation use >6 hours (aOR=9.78 [8.99–10.6]) and antibiotics use (aOR=9.00 [8.43–9.60]). Neonates born at 35 weeks were similarly at risk of morbidity, with higher odds of 5-minute Apgar <7 (aOR 3.42 [3.23–3.63], surfactant use (aOR 3.74 [3.21–4.22], ventilation use >6 hours (aOR 5.53 [5.11–5.99] and NICU admission (aOR 11.3 [11.0–11.7). Further, neonates born at 36 weeks remain at higher risk of morbidity compared to deliveries at 37–40 weeks.
Conclusions
While the risk of undesirable neonatal outcomes decreases with increasing gestational age, the risk of neonatal complications in late preterm births remains higher compared to infants delivered at 37–40 weeks gestation.
doi:10.1111/j.1471-0528.2011.03045.x
PMCID: PMC3403292  PMID: 21883872
late preterm births; perinatal outcomes
17.  Treatment of gestational diabetes mellitus: glyburide compared to subcutaneous insulin therapy and associated perinatal outcomes 
Objective
To examine perinatal outcomes in women with gestational diabetes mellitus treated with glyburide compared to insulin injections.
Study design
This is a retrospective cohort study of women diagnosed with gestational diabetes mellitus (GDM) who required pharmaceutical therapy and were enrolled in the Sweet Success California Diabetes and Pregnancy Program between 2001 and 2004, a California state-wide program. Women managed with glyburide were compared to women treated with insulin injections. Perinatal outcomes were compared using chi-square test and multivariable logistic regression models; statistical significance was indicated by p < 0.05 and 95% confidence intervals (CI).
Results
Among the 10,682 women with GDM who required medical therapy and met study criteria, 2073 (19.4%) received glyburide and 8609 (80.6%) received subcutaneous insulin injections. Compared to insulin therapy and controlling for confounders, oral hypoglycemic treatment was associated with increased risk of birthweight >4000 g (aOR = 1.29; 95% CI [1.03–1.64]), and admission to the intensive care nursery (aOR = 1.46 [1.07–2.00]).
Conclusion
Neonates born to women with gestational diabetes managed on glyburide, and were more likely to be macrosomic and to be admitted to the intensive care unit compared to those treated with insulin injections. These findings should be examined in a large, prospective trial.
doi:10.3109/14767058.2011.580402
PMCID: PMC3443974  PMID: 21631239
Gestational diabetes mellitus; treatment; perinatal outcomes
18.  Treating mild gestational diabetes mellitus: a cost-effectiveness analysis 
OBJECTIVE
This study investigated the cost-effectiveness of treating mild gestational diabetes mellitus (GDM).
STUDY DESIGN
A decision analytic model was built to compare treating vs not treating mild GDM. The primary outcome was the incremental cost per quality-adjusted life year (QALY). All probabilities, costs, and benefits were derived from the literature. Base case, sensitivity analyses, and a Monte Carlo simulation were performed.
RESULTS
Treating mild GDM was more expensive, more effective, and cost-effective at $20,412 per QALY. Treatment remained cost-effective when the incremental cost to treat GDM was less than $3555 or if treatment met at least 49% of its reported efficacy at the baseline cost to treat of $1786.
CONCLUSION
Treating mild GDM is cost-effective in terms of improving maternal and neonatal outcomes including decreased rates of preeclampsia, cesarean sections, macrosomia, shoulder dystocia, permanent and transient brachial plexus injury, neonatal hypoglycemia, neonatal hyperbilirubinemia, and neonatal intensive care unit admissions.
doi:10.1016/j.ajog.2011.06.051
PMCID: PMC3443977  PMID: 22071065
cost-effectiveness; decision analysis; gestational; diabetes mellitus
19.  Delivery After Prior Cesarean: Maternal Morbidity and Mortality 
Clinics in perinatology  2011;38(2):297-309.
doi:10.1016/j.clp.2011.03.012
PMCID: PMC3428794  PMID: 21645797
VBAC; Pregnancy; Pregnancy complications; Cesarean section; Evidence review
20.  Patient counseling increases postpartum follow-up in women with gestational diabetes mellitus 
OBJECTIVE
The objective of the study was to evaluate the efficacy of an educational intervention at increasing the rates of postpartum (PP) follow-up for women with gestational diabetes mellitus (GDM).
STUDY DESIGN
A retrospective cohort study of all patients with GDM delivering during 2002–2009 was conducted. The primary outcome was obtaining PP diabetes testing. The 2002–2006 cohort was advised to obtain PP testing by their providers. The 2007–2009 cohort received educational counseling at the 37–38 week visit by a nurse educator. Univariate and multivariable statistical tests were utilized.
RESULTS
The PP testing frequency was 53% for the 2007–2009 cohort, compared with 33% for the 2002–2006 cohort (P <.001). When stratified by race/ethnicity, increased rates of testing were seen in whites (28% to 53%, P <.001), Latinas (15% to 50%, P <.001), and Asians (43% to 59%, P = .005). There was a nonsignificant decrease in the African American follow-up, 28% to 17% (P =.414).
CONCLUSION
GDM precedes the development of type 2 diabetes. Antepartum education counseling increases postpartum diabetes testing. More efforts are needed to obtain universal screening.
doi:10.1016/j.ajog.2011.01.057
PMCID: PMC3425434  PMID: 21514559
gestational diabetes mellitus; postpartum screening
21.  Effect of gestational weight gain on perinatal outcomes in women with type 2 diabetes mellitus using the 2009 Institute of Medicine guidelines 
OBJECTIVE
We sought to examine associations between gestational weight gain according to the 2009 Institute of Medicine (IOM) guidelines and perinatal outcomes in overweight/obese women with type 2 diabetes mellitus (T2DM).
STUDY DESIGN
This is a retrospective cohort study of 2310 women with T2DM enrolled in the California Diabetes and Pregnancy Program. Gestational weight gain was categorized by 2009 IOM guidelines. Perinatal outcomes were assessed using the χ2 test and multivariable logistic regression analysis.
RESULTS
With excessive gestational weight gain, the odds of having large-for-gestational age (adjusted odds ratio [aOR], 2.00; 95% confidence interval [CI], 1.33–3.00) or macrosomic (aOR, 2.59; 95% CI, 1.56 – 4.30) neonates and cesarean delivery (aOR, 1.47; 95% CI, 1.03–2.10) was higher. Women with excessive gestational weight gain per week had increased odds of preterm delivery (aOR, 1.57; 95% CI, 1.11–2.20).
CONCLUSION
In overweight or obese women with T2DM, gestational weight gain greater than the revised IOM guidelines was associated with higher odds of perinatal morbidity, suggesting these guidelines are applicable to a diabetic population.
doi:10.1016/j.ajog.2011.06.028
PMCID: PMC3425437  PMID: 22071055
gestational weight gain; perinatal outcomes; type 2 diabetes mellitus
22.  EFFECT OF MATERNAL WEIGHT ON POSTTERM DELIVERY 
Journal of Perinatology  2011;32(2):85-90.
Objective
Examine the effect of prepregnancy weight and maternal gestational weight gain on postterm delivery rates.
Methods
This was a retrospective cohort study of term, singleton births (N=375,003). We performed multivariable analyses of the association between postterm pregnancy and both prepregnancy body mass index (BMI) and maternal weight gain.
Results
Prolonged or postterm delivery (41 or 42 weeks) was increasingly common with increasing prepregnancy weight (p<0.001) and increasing maternal weight gain (p<0.001). Underweight women were 10% less likely to deliver postterm than normal weight women who gain within the recommendations (aOR 0.90 (95% CI 0.83, 0.97)). Overweight women who gain within or above recommendations were also at increased risk of a 41 week delivery. Finally, obese women were at increased risk of a 41 week delivery with increasing risk with increasing weight (below, within, and above recommendations aOR 1.19, 1.21, and 1.27, respectively).
Conclusion
Elevated prepregnancy weight and weight gain both increase the risk of a postterm delivery. While most women do not receive preconceptional care, restricting weight gain to the within the recommended range can reduce the risk of postterm pregnancy in normal, overweight, and obese women.
doi:10.1038/jp.2011.63
PMCID: PMC3179793  PMID: 21681179
postterm; prepregnancy weight; prolonged delivery; gestational weight gain
23.  Maternal Super-obesity and Perinatal Outcomes 
OBJECTIVE
To determine the effect of maternal super-obesity (BMI ≥50 kg/m2) compared to morbid obesity (BMI 40–49.9 kg/m2) or obesity (BMI 30–39.9 kg/m2) on perinatal outcomes.
STUDY DESIGN
Retrospective cohort study of birth records linked to hospital discharge data for all live born singleton term infants born to obese Missouri residents from 2000–2006. We excluded major congenital anomalies and women with diabetes or chronic hypertension.
RESULTS
There were 64,272 births meeting study criteria, including 1,185 (1.8%) super-obese mothers. Super-obese women were significantly more likely than obese women to have preeclampsia (aRR 1.7, 95% CI 1.4, 2.1), macrosomia (aRR 1.8, 95% CI 1.3, 2.5), and cesarean delivery (aRR 1.8, 95% CI 1.5, 2.1). Almost half (49.1%) of all super-obese women delivered via cesarean, and 33.8% of super-obese nulliparous women underwent scheduled primary cesarean.
CONCLUSION
Women with a BMI ≥50 kg/m2 are at significantly increased risk for perinatal complications compared to obese women of lower BMI.
doi:10.3109/00016341003657884
PMCID: PMC3316123  PMID: 20438391
pregnancy outcomes; super-obesity
24.  Fetal Outcomes in Pregnancies Complicated by Intrahepatic Cholestasis of Pregnancy in a Northern California Cohort 
PLoS ONE  2012;7(3):e28343.
Background
Intrahepatic cholestasis of pregnancy (ICP) has important fetal implications. There is increased risk for poor fetal outcomes, including preterm delivery, meconium staining of amniotic fluid, respiratory distress, fetal distress and demise.
Methods
One hundred and one women diagnosed with ICP between January 2005 and March 2009 at San Francisco General Hospital were included in this study. Single predictor logistic regression models were used to assess the associations of maternal clinical and biochemical predictors with fetal complications. Clinical predictors analyzed included age, race/ethnicity, gravidity, parity, history of liver or biliary disease, history of ICP in previous pregnancies, and induction. Biochemical predictors analyzed included serum aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, total bilirubin, direct bilirubin, albumin, total protein, and total bile acids (TBA).
Results
The prevalence of ICP was 1.9%. Most were Latina (90%). Labor was induced in the majority (87%) and most were delivered by normal spontaneous vaginal delivery (84%). Fetal complications occurred in 33% of the deliveries, with respiratory distress accounting for the majority of complications. There were no statistically significant clinical or biochemical predictors associated with an increased risk of fetal complications. Elevated TBA had little association with fetal complications until reaching greater than 100 µmoL/L, with 3 out of 5 having reported complications. ICP in previous pregnancies was associated with decreased risk of fetal complications (OR 0.21, p = 0.046). There were no cases of late term fetal demise.
Conclusions
Maternal clinical and laboratory features, including elevated TBA, did not appear to be substantial predictors of fetal complications in ICP.
doi:10.1371/journal.pone.0028343
PMCID: PMC3293870  PMID: 22403605
25.  Infant Formula, Tea, and Water Supplementation of Latino Infants at 4–6 Weeks Postpartum 
The American Academy of Pediatrics recommends exclusive breastfeeding until 6 months- of-age. The authors examined prevalence and risk factors for use of infant formulas, water, and teas at 4–6 weeks in Latino infants in the San Francisco Bay Area, a group at high risk for future obesity. They recruited a cohort of pregnant Latina women (N = 201). Infant dietary recall and postpartum depressive symptoms were assessed at 4–6 weeks. The authors found that 105 women (53.1%) were feeding infant formulas and 48 (25.4%) were supplementing with tea or water. Of those providing water or tea, 60.0% were providing daily supplementation. In multivariate analyses, risk for infant supplementation with water or tea was associated with postpartum depressive symptoms (relative risk, 1.8; 95% confidence interval, 1.1–3.0), cesarean delivery (relative risk, 1.9; 95% confidence interval, 1.3–2.9), and infant formula use (relative risk, 1.3; 95% confidence interval, 1.1–1.6). Early supplementation with water or teas and infant formulas should be discouraged in Latinos, given the high frequency observed in this population. J Hum Lact. 27(2):122–130.
doi:10.1177/0890334410396510
PMCID: PMC3139537  PMID: 21527796
perinatal depression; breastfeeding; infant feeding; complementary feeding; risk factors

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