Validity and Reliability of the 8-Item Work Limitations Questionnaire.
Article
Walker, Timothy J, Tullar, Jessica M, Diamond, Pamela M et al. (2017). Validity and Reliability of the 8-Item Work Limitations Questionnaire.
. Journal of Occupational Rehabilitation, 27(4), 576-583. 10.1007/s10926-016-9687-5
Walker, Timothy J, Tullar, Jessica M, Diamond, Pamela M et al. (2017). Validity and Reliability of the 8-Item Work Limitations Questionnaire.
. Journal of Occupational Rehabilitation, 27(4), 576-583. 10.1007/s10926-016-9687-5
Walker, Timothy J; Tullar, Jessica M; Diamond, Pamela M; Kohl, Harold W; Amick, Benjamin C
abstract
Purpose To evaluate factorial validity, scale reliability, test-retest reliability, convergent validity, and discriminant validity of the 8-item Work Limitations Questionnaire (WLQ) among employees from a public university system. Methods A secondary analysis using de-identified data from employees who completed an annual Health Assessment between the years 2009-2015 tested research aims. Confirmatory factor analysis (CFA) (n = 10,165) tested the latent structure of the 8-item WLQ. Scale reliability was determined using a CFA-based approach while test-retest reliability was determined using the intraclass correlation coefficient. Convergent/discriminant validity was tested by evaluating relations between the 8-item WLQ with health/performance variables for convergent validity (health-related work performance, number of chronic conditions, and general health) and demographic variables for discriminant validity (gender and institution type). Results A 1-factor model with three correlated residuals demonstrated excellent model fit (CFI = 0.99, TLI = 0.99, RMSEA = 0.03, and SRMR = 0.01). The scale reliability was acceptable (0.69, 95% CI 0.68-0.70) and the test-retest reliability was very good (ICC = 0.78). Low-to-moderate associations were observed between the 8-item WLQ and the health/performance variables while weak associations were observed between the demographic variables. Conclusions The 8-item WLQ demonstrated sufficient reliability and validity among employees from a public university system. Results suggest the 8-item WLQ is a usable alternative for studies when the more comprehensive 25-item WLQ is not available.
