Testing the measurement invariance of the University of Washington Self-Efficacy Scale short form across four diagnostic subgroups.

TitleTesting the measurement invariance of the University of Washington Self-Efficacy Scale short form across four diagnostic subgroups.
Publication TypeJournal Article
Year of Publication2016
AuthorsChung H, Kim J, Park R, Bamer AM, Bocell FD, Amtmann D
JournalQual Life Res
Volume25
Issue10
Pagination2559-2564
Date Published2016 Oct
ISSN1573-2649
Abstract

PURPOSE: The University of Washington Self-Efficacy Scale (UW-SES) was originally developed for people with multiple sclerosis (MS) and spinal cord injury (SCI). This study evaluates the measurement invariance of the 6-item short form of the UW-SES across four disability subgroups. Evidence of measurement invariance would extend the UW-SES for use in two additional diagnostic groups: muscular dystrophy (MD) and post-polio syndrome (PPS).
METHODS: Multi-group confirmatory factor analysis was used to evaluate successive levels of measurement invariance of the 6-item short form, the UW-SES: (a) configural invariance, i.e., equivalent item-factor structures between groups; (b) metric invariance, i.e., equivalent unstandardized factor loadings between groups; and (c) scalar invariance, i.e., equivalent item intercepts between groups. Responses from the four groups with different diagnostic disorders were compared: MD (n = 172), MS (n = 868), PPS (n = 225), and SCI (n = 242).
RESULTS: The results of this study support that the most rigorous form of invariance (i.e., scalar) holds for the 6-item short form of the UW-SES across the four diagnostic subgroups.
CONCLUSIONS: The current study suggests that the 6-item short form of the UW-SES has the same meaning across the four diagnostic subgroups. Thus, the 6-item short form is validated for people with MD, MS, PPS, and SCI.

DOI10.1007/s11136-016-1300-z
Alternate JournalQual Life Res
PubMed ID27116230
PubMed Central IDPMC5011442
Grant ListU01 AR052171 / AR / NIAMS NIH HHS / United States