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To evaluate a modified version of the Roland–Morris Disability Questionnaire for differential item functioning (DIF) related to several covariates.
DIF occurs in an item when, after controlling for the underlying trait measured by the test, the probability of endorsing the item varies across groups.
Secondary data analysis of two studies of participants with back pain (total n = 875). We used a hybrid item response theory/ logistic regression approach for detecting DIF. We obtained scores that accounted for DIF. We evaluated the impact of DIF on individual and group scores, and compared scores that ignored or accounted for DIF in terms of the strength of association with SF-36 subscale scores.
DIF was found in 18/23 items. Salient scale-level differential functioning was found related to age, education, and employment. Overall 24 participants (3%) had salient scale-level differential functioning. Mean scores across demographic groups differed minimally when accounting for DIF. The strength of association of scores with SF-36 scores was similar for scores that ignored and scores that accounted for DIF.
The modified version of the Roland–Morris Disability Questionnaire appears to have largely negligible DIF related to the covariates assessed here.
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Camilli, G., & Shepard, L. A. (1994). Methods for identifying biased test items. Thousand Oaks: Sage.
Holland, P. W., & Wainer, H. (Eds.) (1993). Differential item functioning. Hillsdale, NJ: Erlbaum.
Millsap, R. E., & Everson, H. T. (1993). Methodology review: Statistical approaches for assessing measurement bias. Applied Psychological Measurement, 17, 297–334. CrossRef
Deyo, R. A., Mirza, S. K., Heagerty, P. J., Turner, J. A., & Martin, B. I. (2005). A prospective cohort study of surgical treatment for back pain with degenerated discs; study protocol. BMC Musculoskeletal Disorder, 6, 24. CrossRef
Jarvik, J. G., Hollingworth, W., Martin, B., Emerson, S. S., Gray, D. T, Overman, S., Robinson, D., Staiger, T., Wessbecher, F., Sullivan, S. D., Kreuter, W., & Deyo, R. A. (2003). Rapid magnetic resonance imaging vs radiographs for patients with low back pain: A randomized controlled trial. JAMA, 289, 2810–2818. PubMedCrossRef
StataCorp (2003). Stata statistical software: Release 8.0. College Station, TX: Stata Corporation.
Muraki, E., & Bock, D. (2003). PARSCALE for Windows version 4.1. Chicago: SSI.
Crane, P. K., Gibbons, L. E., Ocepek-Welikson, K., Cook, K., Cella, D., Narasimhalu, K., Hays, R., & Teresi, J. (2007). A Comparison of three sets of criteria for determining the presence of differential item functioning using ordinal logistic regression. Quality of Life Research (in press).
Crane, P. K. (2006). Commentary on comparing translations of the EORTC QLQ-C30 using differential item functioning analyses. Quality of Life Research, 15, 1117–1118. CrossRef
Maldonado, G., & Greenland, S. (1993). Simulation study of confounder-selection strategies. American Journal of Epidemiology, 138, 923–936. PubMed
- Differential item functioning impact in a modified version of the Roland–Morris Disability Questionnaire
Paul K. Crane
Karon F. Cook
- Springer Netherlands