title: Confirmatory Factor and Rasch Analyses Support a Revised 14-Item Version of the Organizational, Policies, and Practices (OPP) Scale.
abstract: Background The long version of the organizational, policies and practices (OPP) had a high burden and short versions were developed to solve this drawback. The 11-item version showed promise, but the ergonomic subscale was deficient. The OPP-14 was developed by adding three additional items to the ergonomics subscale. The aim of this study is to evaluate the factor structure using confirmatory factor and Rasch analyses in healthy firefighters. Methods A sample of 261 firefighters (Mean age 42 years, 95 % male) were sampled. A confirmatory factor and Rasch analyses were used to assess the internal consistency, factor structure and other psychometric characteristics of revised OPP-14. Results The OPP-14 demonstrates sound factor structure and internal consistency in firefighters. Confirmatory factor analysis confirmed the consistency of the original 4-domain structure (CFI = 0.97, TLI = 0.96, and RMSEA = 0.053). The 5 items showing misfit initially with disordered thresholds were rescored. The four subscales satisfied Rasch expectations with well target and acceptable reliability. Conclusions The OPP-14 scale shows a promising factor structure in this sample and remediated deficits found in OPP-11. This version may be preferable for musculoskeletal concerns or work applications where ergonomic indicators are relevant.
authors.affiliation: Health and Rehabilitation Sciences, Western University, Room 1014, Elborn College, 1201 Western Road, London, ON, N6G 1H1, Canada. qshi26@uwo.ca.|Hand and Upper Limb Centre Clinical Research Laboratory, St. Joseph's Health Centre, 268 Grosvenor St., London, ON, N6A 3A8, Canada. qshi26@uwo.ca.
authors.forename: Qiyun
authors.initials: Q
authors.lastname: Shi
authors.affiliation: Health and Rehabilitation Sciences, Western University, Room 1014, Elborn College, 1201 Western Road, London, ON, N6G 1H1, Canada.|Hand and Upper Limb Centre Clinical Research Laboratory, St. Joseph's Health Centre, 268 Grosvenor St., London, ON, N6A 3A8, Canada.|The School of Rehabilitation Sciences, McMaster University, Hamilton, ON, L8S 4L8, Canada.|Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, L8S 4K1, Canada.
authors.forename: Joy C
authors.initials: JC
authors.lastname: MacDermid
authors.affiliation: The School of Rehabilitation Sciences, McMaster University, Hamilton, ON, L8S 4L8, Canada.
authors.forename: Kenneth
authors.initials: K
authors.lastname: Tang
authors.affiliation: Department of Kinesiology and Physical Education, McGill University, Montreal, QC, H3A 0G4, Canada.
authors.forename: Kathryn E
authors.initials: KE
authors.lastname: Sinden
authors.affiliation: Health and Rehabilitation Sciences, Western University, Room 1014, Elborn College, 1201 Western Road, London, ON, N6G 1H1, Canada.
authors.forename: Dave
authors.initials: D
authors.lastname: Walton
authors.affiliation: Division of Orthopaedic Surgery, University of Western Ontario, London, ON, N6A 4L6, Canada.
authors.forename: Ruby
authors.initials: R
authors.lastname: Grewal
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D006804:Ergonomics / Q000592:standards; D005163:Factor Analysis, Statistical; D005260:Female; D061388:Firefighters; D006801:Humans; D008297:Male; D008875:Middle Aged; D016272:Occupational Health / Q000592:standards; D060051:Occupational Injuries / Q000517:prevention & control*; D016134:Organizational Policy; D011594:Psychometrics; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*
keywords: Confirmatory factor analysis; Organizational policies and practices; Rasch analysis; Work disability