The prevalence rates of Musculoskeletal disorder by the classifying criteria and ward or unit appear in Fig. 1.
To enhance the reliability of the w2 test, wards or units with similar functions were amalgamated to have at least five nurses in each cell of the contingency table in the w2 test. Thus, the anesthesia recovery room was merged into the operation room, and the obstetrics and gynecology ward into the medical ward.