Rahul Khanna1, Krutika Jariwala2, Donna West-Strum3. 1. Faser Hall 236, Department of Pharmacy Administration, School of Pharmacy, The University of Mississippi, University, MS 38677, United States. Electronic address: rkhanna@olemiss.edu. 2. Faser Hall 211, Department of Pharmacy Administration, School of Pharmacy, The University of Mississippi, University, MS 38677, United States. 3. Faser Hall 223, PO Box 1848, Department of Pharmacy Administration, School of Pharmacy, The University of Mississippi, University, MS 38677, United States.
Abstract
BACKGROUND: The purpose of the study was to assess the validity and reliability of the Medical Outcomes Study Short Form-12 version 2 (SF-12v2) instrument among adults with autism. METHODS: Study data was collected using a cross-sectional online survey of adults with autism enrolled with the Interactive Autism Network (N=291). Factorial validity was assessed using confirmatory factor analysis technique. Item-scale correlations were examined for convergent validity. Known-groups validity was assessed by examining the variation in Physical Component Summary (PCS) and Mental Component Summary (MCS) scores by autism severity. Cronbach's alpha was determined for internal consistency reliability. Floor and ceiling effects were also assessed. RESULTS: A two-factor model with correlated error terms was found to have a good fit. The PCS scale strongly correlated with the underlying items representing the scale. The MCS scale had strong to moderate correlation with its underlying items. For known-groups validity, the MCS score varied as expected with lower score observed among adults with high severity as compared to low severity; however, PCS score varied inversely. Internal consistent reliability of the SF-12v2 was good, and there were no floor and ceiling effects. CONCLUSIONS: Except for known-groups validity, all other psychometric indicators performed well for the SF-12v2.
BACKGROUND: The purpose of the study was to assess the validity and reliability of the Medical Outcomes Study Short Form-12 version 2 (SF-12v2) instrument among adults with autism. METHODS: Study data was collected using a cross-sectional online survey of adults with autism enrolled with the Interactive Autism Network (N=291). Factorial validity was assessed using confirmatory factor analysis technique. Item-scale correlations were examined for convergent validity. Known-groups validity was assessed by examining the variation in Physical Component Summary (PCS) and Mental Component Summary (MCS) scores by autism severity. Cronbach's alpha was determined for internal consistency reliability. Floor and ceiling effects were also assessed. RESULTS: A two-factor model with correlated error terms was found to have a good fit. The PCS scale strongly correlated with the underlying items representing the scale. The MCS scale had strong to moderate correlation with its underlying items. For known-groups validity, the MCS score varied as expected with lower score observed among adults with high severity as compared to low severity; however, PCS score varied inversely. Internal consistent reliability of the SF-12v2 was good, and there were no floor and ceiling effects. CONCLUSIONS: Except for known-groups validity, all other psychometric indicators performed well for the SF-12v2.
Authors: Mark Rodgers; David Marshall; Mark Simmonds; Ann Le Couteur; Mousumi Biswas; Kath Wright; Dheeraj Rai; Stephen Palmer; Lesley Stewart; Robert Hodgson Journal: Health Technol Assess Date: 2020-07 Impact factor: 4.014
Authors: Mohsen Bazargan; James L Smith; Paul Robinson; John Uyanne; Ruqayyah Abdulrahoof; Chika Chuku; Shervin Assari Journal: Int J Environ Res Public Health Date: 2019-05-17 Impact factor: 3.390
Authors: Samuel Arnold; Kitty-Rose Foley; Ye In Jane Hwang; Amanda L Richdale; Mirko Uljarevic; Lauren P Lawson; Ru Ying Cai; Torbjorn Falkmer; Marita Falkmer; Nick G Lennox; Anna Urbanowicz; Julian Trollor Journal: BMJ Open Date: 2019-12-04 Impact factor: 2.692