Musculoskeletal disorders among workers in plastic manufacturing plants

Abstract

Background: Epidemiological studies have indicated an association between musculo-skeletal disorders (MSDs) and physical work demands. Psychosocial work demands have also been identified as possible risk factors, but findings have been inconsistent. Object-ives: To evaluate factors associated with up-per back, neck and upper limb MSD among workers from 14 plastic manufacturing companies located in the city of Salvador, Brazil. Methods: A cross-sectional study design was used to survey a stratified pro-portional random sample of 577 workers. Data were collected by questionnaire inter-views. Factor analysis was carried out on 11 physical demands variables. Psychosocial work demands were measured by demand, control and social support questions. The role of socio-demographic factors, lifestyle and household tasks was also examined. Multiple logistic regression was used to identify factors related to upper back, neck and upper limb MSDs. Results: Results from multiple logistic regression showed that distal upper limb MSDs were related to manual handling, work repetitiveness, psychosocial demands, job dissatisfaction, and gender. Neck, shoulder or upper back MSDs were related to manual handling, work repetitiveness, psychosocial demands, job dissatisfaction, and physical unfitness. Conclusions: Reducing the prevalence of musculoskeletal disorders requires: improv-ing the work environment, reducing biome-chanical risk factors, and replanning work organization. Programs must also be aware of gender specificities related to MSDs.