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Interaction between postural risk factors and job strain on self-reported musculoskeletal symptoms among users of video display units: a three-year prospective study.

Authors
Lapointe-J; Dionne-CE; Brisson-C; Montreuil-S
Source
Scand J Work, Environ & Health 2009 Mar; 35(2):134-144
NIOSHTIC No.
20035442
Abstract
OBJECTIVE: This study investigated a possible interaction between postural risk factors and job strain on the incidence proportion of self-reported musculoskeletal symptoms in the shoulder-neck, lower back and upper limbs regions. METHODS: A cohort of white-collar workers (N=2431) was assessed with a self-administered questionnaire regarding postural risk factors and job strain at work. After a three-year follow-up, the six-month incidence proportion of musculoskeletal symptoms in the three body regions was measured with a modified version of the Nordic questionnaire. The analyses were stratified for gender. Interaction was defined as a departure from the addition of effects of individual risk factors, and its importance was estimated from the attributable proportion due to interaction and its 95% confidence interval (95% CI). RESULTS: A significant attributable proportion of 0.80 (95% CI 0.23-1.37) due to interaction between postural risk factors and job strain was observed for men in the lower back region. An indication of interaction was found for women with attributable proportions due to interaction of 0.44 (95% CI -0.06-0.94), 0.27 (95% CI -0.34-0.88) and 0.36 (95% CI -0.33-1.05) for the shoulder-neck, lower back, and upper limbs regions, respectively. CONCLUSIONS: The simultaneous presence of postural risk factors and job strain seems to increase the pathogenic effect of each exposure on the incidence proportion of musculoskeletal symptoms. This interaction effect is important for work intervention practices as success in decreasing any of these two risk factors could have the additional benefit of reducing up to 80% of new cases of musculoskeletal symptoms among participants exposed to both risk factors.
Keywords
Back-injuries Job-analysis; Job-stress; Men; Musculoskeletal-system; Musculoskeletal-system-disorders; Neck-injuries; Occupational-exposure; Occupational-health; Posture; Questionnaires; Risk-analysis; Risk-factors; Sex-factors; Statistical-analysis; Women; Worker-health; Work-performance; Workplace-studies; Work-practices; Author Keywords: combined effect; computer work; etiology; job strain; Karasek's model; musculoskeletal symptom; occupational disease; postural risk factor; prospective study; psychosocial factor; risk factor; video display unit; workload
Contact
Julie Lapointe, Population Health Research Unit, Research Center of the Laval University Affiliated Hospital, 1050 Chemin Ste-Foy, Québec, Canada, G1S 4L8
CODEN
SWEHDO
Publication Date
20090301
Document Type
Journal Article
Email Address
julie.lapointe@uresp.ulaval.ca
Funding Type
Grant
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-007647
Issue of Publication
2
ISSN
0355-3140
Source Name
Scandinavian Journal of Work, Environment and Health
Performing Organization
University of Quebec
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