A 37-item shoulder functional status item pool had negligible differential item functioning

Journal of Clinical Epidemiology
Paul K CraneKaron F Cook

Abstract

Measures of shoulder function may differ by dominance of affected shoulder, surgical history, gender, or race. We present a technique for determining whether observed differences in function between groups are due to biased test items or real differences in function. Four hundred patients who were receiving rehabilitation for a variety of shoulder impairments completed a survey of shoulder function. Thirty-seven items measuring shoulder function were analyzed for differential item functioning (DIF) related to demographic characteristics using an ordinal logistic regression (OLR) and item response theory (IRT) approach. When DIF was identified in an item, we modified the IRT analysis to calibrate item parameters separately in appropriate demographic groups. We compared adjusted and unadjusted patient ability measures in each demographic group. Several items were found to have a modest amount of DIF related to the different demographic characteristics, especially gender; however, adjusting measures for DIF had little impact on overall measures of shoulder function and made almost no difference in average shoulder function across demographic groups. In this pool of shoulder function items, adjustment for DIF made almost no differe...Continue Reading

References

Jan 13, 2004·Statistics in Medicine·Paul K CraneEric B Larson

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Citations

Nov 18, 2006·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Paul K CraneDavid Cella
Jun 8, 2007·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Paul K CraneJeanne A Teresi
Apr 20, 2007·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Paul K CraneDagmar Amtmann
Aug 2, 2007·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Stephane RobitailUNKNOWN KIDSCREEN Group
Aug 19, 2008·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Dennis L HartJerome E Mioduski
Aug 5, 2009·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Dennis L HartYing-Chih Wang
Sep 4, 2008·Journal of the International Neuropsychological Society : JINS·Paul K CraneDan M Mungas
Aug 31, 2010·Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists·Ying-Chih WangJerome E Mioduski
Nov 11, 2008·Archives of Physical Medicine and Rehabilitation·Dennis L HartJerome E Mioduski
Aug 5, 2008·Archives of Physical Medicine and Rehabilitation·Michelle L WoodburySue-Min Lai
Jul 16, 2008·Journal of Clinical Epidemiology·Dennis L HartJerome E Mioduski
May 6, 2008·Journal of Clinical Epidemiology·Paul K CraneGerald van Belle
Sep 4, 2015·International Urology and Nephrology·Zahra BagheriTania Dehesh
Aug 5, 2009·Archives of Physical Medicine and Rehabilitation·Daniel DeutscherIlana Ariel
Jul 15, 2015·The Journal of Orthopaedic and Sports Physical Therapy·Ying-Chih WangJerome E Mioduski
Jun 12, 2012·Neuromuscular Disorders : NMD·Tadanori HamanoMasaru Kuriyama
Aug 6, 2010·Health and Quality of Life Outcomes·Neil W ScottUNKNOWN EORTC Quality of Life Group and the Quality of Life Cross-Cultural Meta-Analysis Group
Jul 19, 2014·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Dejan Stevanovic, Peyman Jafari
Mar 5, 2011·Physical Therapy·Ying-Chih WangJerome E Mioduski
Feb 5, 2015·Research on Aging·Liliana B SousaMário R Simões
Oct 19, 2007·Multiple Sclerosis : Clinical and Laboratory Research·Mc SimeoniUNKNOWN MusiQol study group

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