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Validity and Reliability of a Job Factors Questionnaire Related to the Work Tasks of Physical Therapists

Shimabukuro V. G. P., Alexandre N. M.C., Coluci M.Z.O., Rosecrance J. C., Gallani M. C. J. B.

International Journal of Occupational Safety and Ergonomics

2012

Vol. 18, No. 1

15--26

Physical therapists engage in work tasks that expose them to occupational risk factors related to musculoskeletal disorders. Due to the gap in the literature on instruments focused on those workers, this study adapted a job factors questionnaire to physical therapists, and assessed its psychometric properties. The questionnaire was adapted and its content validity was established. The psychometric properties were evaluated among 142 physical therapists. Reliability was verified using the temporal-stability design and internal consistency. Construct validity was assessed with the known-groups technique. Test–retest results demonstrated intraclass correlation coefficients between .82 and .90 (p < .001). Cronbach’s α of .91 verified the reliability of the questionnaire. The known-groups technique demonstrated a statistically significant difference on the scores of the items when physical therapists were compared to office workers. The results indicated that the adapted questionnaire had acceptable psychometric properties for assessing problematic job factors among physical therapists working in hospitals.