title: A Multidisciplinary Work-Related Low Back Pain Predictor Questionnaire: Psychometric Evaluation of Iranian Patient-Care Workers.
abstract: METHODS
  Psychometric evaluation design.
  
  
  OBJECTIVE
  Psychometric evaluation of a multidisciplinary work-related low back pain predictor questionnaire (MWRLBPPQ) of Iranians patient-care workers based on the social cognitive theory.
  
  
  BACKGROUND
  Healthcare is one of the professions in which work-related musculoskeletal disorders are prevalent. The chronic low back pain experienced by patient caregivers can negatively impact their professional performance, and patient handling in a hospital is the main cause of low back pain in this population.
  
  
  METHODS
  This was a cross-sectional study carried out in Qom, Iran from July 2014 to November 2014. A MWRLBPPQ based on nine concepts of the social cognitive theory and existing literature regarding chronic low back pain was developed. Ten patient-care workers first completed the questionnaire as a pilot test, allowing the ambiguities of the instrument to be resolved. Exploratory factor analysis was used to confirm construct validity. This questionnaire was distributed among 452 patient-care workers in hospitals located in different geographically areas in Qom, Iran. Cronbach's Alpha was calculated to assess reliability.
  
  
  RESULTS
  In all, 452 caregivers of patients with mean age of 37.71 (standard deviation=8.3) years participated in the study. An exploratory factor analysis loaded seven concepts of self-efficacy, knowledge, outcome perception, self-control, emotional coping, and self-efficacy in overcoming impediments and challenges in the environment. All concepts were jointly accounted for 50.08% of variance of behavior change. The Cronbach's alpha coefficient showed favorable internal consistency (alpha=0.83), and test-retest of the scale with 2-week intervals indicated an appropriate stability for the MWRLBPPQ.
  
  
  CONCLUSIONS
  The MWRLBPPQ is a reliable and valid theory-based instrument that can be used to predict factors influencing work-related low back pain among workers who lift and transfer patients in hospitals.
authors.affiliation: Department of Health Education, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
authors.forename: Shojaei
authors.initials: S
authors.lastname: Sarallah
authors.affiliation: Department of Health Education, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
authors.forename: Tavafian Sedigheh
authors.initials: TS
authors.lastname: Sadat
authors.affiliation: Rheumatology Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Ahmad Reza
authors.initials: AR
authors.lastname: Jamshidi
authors.affiliation: Department of Philosophy (Rehabilitation Science), University of Alberta, Edmonton, AB, Canada.
authors.forename: Wagner
authors.initials: W
authors.lastname: Joan
keywords: Multidisciplinary; Patient-care workers; Questionnaire development; Social cognitive theory; Work-related low back pain