The role of circadian rhythm stability and amplitude in musculoskeletal disorder prevalence and work-family conflict.

The highest prevalence of musculoskeletal disorders was reported in the lower back (68.4%), upper back (65.5%) and shoulders (53.6%), respectively. No significant relation was found between circadian rhythm stability and amplitude, and musculoskeletal disorders prevalence. The nurses who could not overcome drowsiness reported more Work Interference with Family (WIF), Family Interference with Work (FIW) (time-based) and FIW (strain-based) compared to the nurses who overcame drowsiness. In addition, the appropriate nurses for shift work experienced less WIF, FIW (behavioural-based) and WIF (strain-based) compared to the nurses who could not work overtime or at night.