Ijzelenberg, W.

sickness absence health complaint musculoskeletal worker absence sickness study factor health care utilization musculoskeletal complaints intervention month extremity subject productivity risk factors 12 months work-related utilization chapter questionnaire result population occurrence measure extremity complaints health problems comorbidity prevalence program group prevention problem follow-up question pain prevention program effect disability model musculoskeletal comorbidity characteristic 6 months symptom spine impact occup environ med job demands patient co-morbidity environ netherland baseline table level workplace education productivity losses score musculoskeletal co-morbidity scale construction workers practitioner control variable occup cluster quality musculoskeletal symptoms musculoskeletal sickness absence work-related factors job control company therapist productivity loss association demand presence burdorf outcome