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1.  Impaired work functioning due to common mental disorders in nurses and allied health professionals: the Nurses Work Functioning Questionnaire 
Purpose
Common mental disorders (CMD) negatively affect work functioning. In the health service sector not only the prevalence of CMDs is high, but work functioning problems are associated with a risk of serious consequences for patients and healthcare providers. If work functioning problems due to CMDs are detected early, timely help can be provided. Therefore, the aim of this study is to develop a detection questionnaire for impaired work functioning due to CMDs in nurses and allied health professionals working in hospitals.
Methods
First, an item pool was developed by a systematic literature study and five focus group interviews with employees and experts. To evaluate the content validity, additional interviews were held. Second, a cross-sectional assessment of the item pool in 314 nurses and allied health professionals was used for item selection and for identification and corroboration of subscales by explorative and confirmatory factor analysis.
Results
The study results in the Nurses Work Functioning Questionnaire (NWFQ), a 50-item self-report questionnaire consisting of seven subscales: cognitive aspects of task execution, impaired decision making, causing incidents at work, avoidance behavior, conflicts and irritations with colleagues, impaired contact with patients and their family, and lack of energy and motivation. The questionnaire has a proven high content validity. All subscales have good or acceptable internal consistency.
Conclusion
The Nurses Work Functioning Questionnaire gives insight into precise and concrete aspects of impaired work functioning of nurses and allied health professionals. The scores can be used as a starting point for purposeful interventions.
Electronic supplementary material
The online version of this article (doi:10.1007/s00420-011-0649-0) contains supplementary material, which is available to authorized users.
doi:10.1007/s00420-011-0649-0
PMCID: PMC3266505  PMID: 21626312
Occupational health; Work functioning; Questionnaire; Common mental disorders; Nurses
2.  Work-related upper extremity disorders: one-year follow-up in an occupational diseases registry 
Purpose
To study the course and consequences of work-related upper extremity disorders in the registry of the Netherlands Centre for Occupational Diseases (NCvB).
Methods
A follow-up study was performed in a sample of consecutive cases of work-related upper extremity disorders notified to the NCvB. Perceived severity was measured with VAS (0-100), quality of life with VAS (0-100) and SF-36, functional impairment with DASH and sickness absence with a questionnaire. Measurements took place directly after notification (T0) and after 3, 6 and 12 months (T1-T3). A linear mixed model was used to compare scores over time.
Results
Average age of the 48 consecutive patients (89% response) was 42 years; 48% were men. Perceived severity, functional impairment and sickness absence decreased statistically significant during the follow-up period, and quality of life scores improved. Patients older than 45 years scored worse on perceived severity of the disease, functional impairment and quality of life than did younger patients.
Conclusions
The role of registries of occupational diseases for preventive policy can be extended by creating longitudinal data in sample projects. In the sample from our registry, work-related upper extremity disorders had a favourable course.
doi:10.1007/s00420-011-0611-1
PMCID: PMC3172420  PMID: 21274724
Occupational diseases; Registries; Follow-up; Upper extremity disorders; Functional impairment
3.  Factors Associated with Work Participation and Work Functioning in Depressed Workers: A Systematic Review 
Background Depression is associated with negative work outcomes such as reduced work participation (WP) (e.g., sick leave duration, work status) and work functioning (WF) (e.g., loss of productivity, work limitations). For the development of evidence-based interventions to improve these work outcomes, factors predicting WP and WF have to be identified. Methods This paper presents a systematic literature review of studies identifying factors associated with WP and WF of currently depressed workers. Results A total of 30 studies were found that addressed factors associated with WP (N = 19) or WF (N = 11). For both outcomes, studies reported most often on the relationship with disorder-related factors, whereas personal factors and work-related factors were less frequently addressed. For WP, the following relationships were supported: strong evidence was found for the association between a long duration of the depressive episode and work disability. Moderate evidence was found for the associations between more severe types of depressive disorder, presence of co-morbid mental or physical disorders, older age, a history of previous sick leave, and work disability. For WF, severe depressive symptoms were associated with work limitations, and clinical improvement was related to work productivity (moderate evidence). Due to the cross-sectional nature of about half of the studies, only few true prospective associations could be identified. Conclusion Our study identifies gaps in knowledge regarding factors predictive of WP and WF in depressed workers and can be used for the design of future research and evidence-based interventions. We recommend undertaking more longitudinal studies to identify modifiable factors predictive of WP and WF, especially work-related and personal factors.
Electronic supplementary material
The online version of this article (doi:10.1007/s10926-009-9224-x) contains supplementary material, which is available to authorized users.
doi:10.1007/s10926-009-9224-x
PMCID: PMC2923705  PMID: 20091105
Depressive disorder; Occupational health; Work disability; Workplace; Sick leave; Unemployment
4.  Evaluation of an occupational health intervention programme on whole‐body vibration in forklift truck drivers: a controlled trial 
Objectives
To evaluate process and outcome of a multifaceted occupational health intervention programme on whole‐body vibration (WBV) in forklift truck drivers.
Methods
An experimental pretest/post‐test control group study design. The authors trained occupational health services (OHS) in the experimental group in the use of the programme. OHS in the control group were asked to deliver care as usual. In total, 15 OHS, 32 OHS professionals, 26 companies, and 260 forklift drivers were involved. Post‐test measurements were carried out one year after the start of the programme.
Results
Baseline data before the start of the programme showed no difference between experimental and control group. Results of the outcome evaluation indicate a slight, although not statistically significant, reduction of WBV exposure in the experimental group (p = 0.06). Process evaluation revealed a positive influence on company policy toward WBV, attitude and intended behaviour of forklift drivers, and a trend towards an increase in knowledge of OHS professionals and company managers. The number of observed control measures with a major impact (levelling of surface and reduction of speed) was rather low. In those cases where control measures had been taken, there was a significant reduction in WBV exposure. This limited effect of the programme might be caused by the short period of follow up and the dropout of participants. The feasibility and the usefulness of the programme within the OHS setting were rated good by the participants.
Conclusions
This programme to decrease WBV exposure was partially effective. Significant effects on intermediate objectives were observed. More research on the effectiveness of intervention in the field of WBV is needed.
doi:10.1136/oem.2005.020032
PMCID: PMC2092505  PMID: 16551762
occupational health services; prevention; back pain; occupational physicians; occupational hygiene; occupational exposure
5.  Work ability and return-to-work in cancer patients 
British Journal of Cancer  2008;98(8):1342-1347.
The extent to which self-assessed work ability collected during treatment can predict return-to-work in cancer patients is unknown. In this prospective study, we consecutively included employed cancer patients who underwent treatment with curative intent at 6 months following the first day of sick leave. Work ability data (scores 0–10), clinical and sociodemographic data were collected at 6 months, while return-to-work was measured at 6, 12 and 18 months. Most of the 195 patients had been diagnosed with breast cancer (26%), cancer of the female genitals (22%) or genitourological cancer (22%). Mean current work ability scores improved significantly over time from 4.6 at 6 months to 6.3 and 6.7 at 12 and 18 months, respectively. Patients with haematological cancers and those who received chemotherapy showed the lowest work ability scores, while patients with cancer of urogenital tract or with gastrointestinal cancer had the highest scores. Work ability at 6 months strongly predicted return-to-work at 18 months, after correction for the influence of age and treatment (hazard ratio=1.37, CI 1.27–1.48). We conclude that self-assessed work ability is an important factor in the return-to-work process of cancer patients independent of age and clinical factors.
doi:10.1038/sj.bjc.6604302
PMCID: PMC2361697  PMID: 18349834
employment; work ability; return-to-work; longitudinal studies; prospective studies
6.  An occupational health intervention programme for workers at risk for early retirement; a randomised controlled trial 
Aims: To evaluate an occupational health intervention programme for workers at risk for early retirement.
Methods: Between April 1997 and May 1998, 116 employees of a large company who were older than 50 years indicated that they would not be able to work up to their retirement. They were randomly assigned to an intervention (n = 61) or control group (n = 55). The intervention programme lasted six months and was executed by an occupational physician. Job position and number of sick leave days after two years were collected from the company's computer database. A questionnaire was sent to the employees at baseline, after six months, and after two years; it included the Work Ability Index, the Utrecht Burn Out Scale, and the Nottingham Health Profile measuring quality of life.
Results: Fewer employees (11%) in the intervention group retired early than in the control group (28%). The total average number of sick leave days in two years was 82.3 for the intervention group and 107.8 for the control group. Six months after baseline, employees in the intervention group had better work ability, less burnout, and better quality of life than employees in the control group. Two years after randomisation no differences between the two groups were found.
Conclusions: This occupational health intervention programme proved to be a promising intervention in the prevention of early retirement.
doi:10.1136/oem.2003.009746
PMCID: PMC1757884  PMID: 15477286
7.  Supervisory behaviour as a predictor of return to work in employees absent from work due to mental health problems 
Aims: To study supervisory behaviour as a predictive factor for return to work of employees absent due to mental health problems; and to explore the association between conditional factors and supervisory behaviour.
Methods: Eighty five supervisors of employees were interviewed by telephone. Questionnaires providing information on person related factors, depressive symptoms, and sickness absence were sent to the employees at baseline, three months, six months, and after one year. Three aspects of supervisory behaviour during the period of absence were measured: communication with the employee, promoting gradual return to work, and consulting of other professionals.
Results: Better communication between supervisor and employee was associated with time to full return to work in non-depressed employees. For employees with a high level of depressive symptoms, this association could not be established. Consulting other professionals more often was associated with a longer duration of the sickness absence for both full and partial return to work. If sickness absence had financial consequences for the department, the supervisor was more likely to communicate frequently with the employee. Supervisors who were responsible for return to work in their organisation were more likely to communicate better and to consult more often with other professionals.
Conclusion: Supervisors should communicate more frequently with employees during sickness absence as well as hold follow up meetings more often as this is associated with a faster return to work in those employees.
doi:10.1136/oem.2003.009688
PMCID: PMC1740675  PMID: 15377767
8.  The Depression Anxiety Stress Scales (DASS): detecting anxiety disorder and depression in employees absent from work because of mental health problems 
Occupational and Environmental Medicine  2003;60(Suppl 1):i77-i82.
Aims: To (1) evaluate the psychometric properties and (2) examine the ability to detect cases with anxiety disorder and depression in a population of employees absent from work because of mental health problems.
Methods: Internal consistency, construct validity, and criterion validity of the Depression Anxiety Stress Scales (DASS) were assessed. Furthermore, the ability to identify anxiety disorders or depression was evaluated by calculating posterior probabilities of these disorders following positive and negative test results for different cut off scores of the DASS-Depression and DASS-Anxiety subscales.
Results: Internal consistency of the DASS subscales was high, with Cronbach's alphas of 0.94, 0.88, and 0.93 for depression, anxiety, and stress respectively. Factor analysis revealed a three factor solution, which corresponded well with the three subscales of the DASS. Construct validity was further supported by moderately high correlations of the DASS with indices of convergent validity (0.65 and 0.75), and lower correlations of the DASS with indices of divergent validity (range -0.22 to 0.07). Support for criterion validity was provided by a statistically significant difference in DASS scores between two diagnostic groups. A cut off score of 5 for anxiety and 12 for depression is recommended. The DASS showed probabilities of anxiety and depression after a negative test result of 0.05 and 0.06 respectively. Probabilities of 0.29 for anxiety disorder and 0.33 for depression after a positive test result reflect relatively low specificity of the DASS.
Conclusion: The psychometric properties of the DASS are suitable for use in an occupational health care setting. The DASS can be helpful in ruling out anxiety disorder and depression in employees with mental health problems.
doi:10.1136/oem.60.suppl_1.i77
PMCID: PMC1765723  PMID: 12782751
9.  Fatigue at work 
Occupational and Environmental Medicine  2003;60(Suppl 1):i1-i2.
doi:10.1136/oem.60.suppl_1.i1
PMCID: PMC1765722  PMID: 12782739
10.  Reducing long term sickness absence by an activating intervention in adjustment disorders: a cluster randomised controlled design 
Aims: To compare an innovative activating intervention with "care as usual" (control group) for the guidance of employees on sickness leave because of an adjustment disorder. It was hypothesised that the intervention would be more effective than care as usual in lowering the intensity of symptoms, increasing psychological resources, and decreasing sickness leave duration.
Methods: A prospective, cluster randomised controlled trial was carried out with 192 patients on first sickness leave for an adjustment disorder. Symptom intensity, sickness duration, and return to work rates were measured at 3 months and 12 months. Analyses were performed on an intention to treat basis.
Results: At 3 months, significantly more patients in the intervention group had returned to work compared with the control group. At 12 months all patients had returned to work, but sickness leave was shorter in the intervention group than in the control group. The recurrence rate was lower in the intervention group. There were no differences between the two study groups with regard to the decrease of symptoms. At baseline, symptom intensity was higher in the patients than in a normal reference population, but decreased over time in a similar manner in both groups to approximately normal levels.
Conclusion: The experimental intervention for adjustment disorders was successful in shortening sick leave duration, mainly by decreasing long term absenteeism.
doi:10.1136/oem.60.6.429
PMCID: PMC1740545  PMID: 12771395
11.  Pushing and pulling in association with low back and shoulder complaints 
Aims: To examine the association between exposure to pushing/pulling at work and low back and shoulder complaints.
Methods: A cross sectional questionnaire survey was carried out among 434 workers from several companies with mainly pushing/pulling tasks. From the same companies 188 workers without physically demanding tasks served as reference. The questionnaire was used to assess the exposure to pushing/pulling and other physical risk factors for low back and shoulder complaints. Mean scores at company level were used to classify groups into medium and high exposed to pushing/pulling and a reference group. Psychosocial factors at work were also assessed. Several pain related questionnaires were used to assess the 12 month prevalence of low back and shoulder complaints in three dimensions: trouble (ache, pain, discomfort), pain intensity, and disability. Prevalence rate ratios (PRs) were calculated using Cox's proportional hazards regression analysis.
Results: The 12 month prevalence of low back complaints was almost equal for all three groups. The prevalence of shoulder complaints increased with an increase in exposure level. Adjusted PRs showed that the high exposed group had an increased risk for low back complaints compared to the reference group. For all dimensions of shoulder complaints a clear tendency towards a dose–response relation was observed. The high exposed group had significant PRs for shoulder complaints, ranging from 2.09 to 6.37. Generally, psychosocial factors had a confounding effect for pain intensity and disability, but not for trouble.
Conclusions: For shoulder complaints a dose–response relation was observed for exposure to pushing/pulling. Low back complaints were less consistently associated with pushing/pulling. Stronger associations were observed for more severe cases of low back and shoulder complaints. It is hypothesised that work related psychosocial factors affect these associations.
doi:10.1136/oem.59.10.696
PMCID: PMC1740222  PMID: 12356931
12.  Communication between Dutch rheumatologists and occupational physicians in the occupational rehabilitation of patients with rheumatic diseases 
Objective: To assess the quality and quantity of communication and cooperation between Dutch rheumatologists and occupational physicians.
Methods: A postal survey among 187 Dutch rheumatologists.
Results: 153/187 rheumatologists (82%) returned the questionnaire. They considered reducing pain and fatigue to be their major responsibility in the process of occupational rehabilitation, followed by improving work participation (68/153 (44%)) and quality of work (55/153 (36%)). Although 112/153 (73%) of the rheumatologists judged the communication and cooperation with occupational physicians as reasonable to good, 119/153 (78%) of them were willing to improve the collaboration. Perceived bottlenecks mentioned were a lack of clarity about the occupational physician's position and activities, and the absence of practice guidelines. The most important prerequisites for improvement were found to be guarantees about the occupational physician's professional independence and more clarity about the competence of the occupational physicians and how they used the information provided.
Conclusion: Dutch rheumatologists are willing to improve cooperation and communication with occupational physicians. The perceived lack of clarity about their mutual tasks appears to be a major obstacle. Thus the development of a joint education programme and a guideline for occupational rehabilitation in rheumatic diseases may be appropriate first steps towards improvement.
doi:10.1136/ard.61.1.62
PMCID: PMC1753888  PMID: 11779762
13.  Evaluation of a postgraduate educational programme for occupational physicians on work rehabilitation guidelines for patients with low back pain 
OBJECTIVES—The postgraduate educational programme for occupational physicians on guidelines for work rehabilitation of patients with low back pain was evaluated as to what extent did knowledge of the guidelines increase, and did the workers improve their performance at work.
METHODS—An experimental group (n=25) attended an educational programme and a reference group did so (n=20) 6 months later. Knowledge and performance were assessed for both groups, before and after education of the experimental group. Knowledge was assessed for the reference group after education.
RESULTS—Knowledge increased significantly more in the experimental group. The reference group's score increased further after education. The experimental group's adjusted gain score for performance indicators was significantly positive. Analysis of covariance also showed a significant effect for the experimental group for increased performance score.
CONCLUSIONS—The educational programme improved the quality of care because knowledge and performance of occupational physicians improved and complied better with practice guidelines.


Keywords: evaluation; postgraduate education; occupational physicians; low back pain; guidelines
doi:10.1136/oem.57.9.645
PMCID: PMC1740020  PMID: 10935947

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