Negligible impact of differential item functioning between Black and White dialysis patients on the Kidney Disease Quality of Life 36-item short form survey (KDQOLTM -36)

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
John D PeipertRon D Hays

Abstract

Black dialysis patients report better health-related quality of life (HRQOL) than White patients, which may be explained if Black and White patients respond systematically differently to HRQOL survey items. We examined differential item functioning (DIF) of the Kidney Disease Quality of Life 36-item (KDQOLTM-36) Burden of Kidney Disease, Symptoms and Problems with Kidney Disease, and Effects of Kidney Disease scales between Black (n = 18,404) and White (n = 21,439) dialysis patients. We fit multiple group confirmatory factor analysis models with increasing invariance: a Configural model (invariant factor structure), a Metric model (invariant factor loadings), and a Scalar model (invariant intercepts). Criteria for invariance included non-significant χ2 tests, > 0.002 difference in the models' CFI, and > 0.015 difference in RMSEA and SRMR. Next, starting with a fully invariant model, we freed loadings and intercepts item-by-item to determine if DIF impacted estimated KDQOLTM-36 scale means. ΔCFI was 0.006 between the metric and scalar models but was reduced to 0.001 when we freed intercepts for the burdens and symptoms and problems of kidney disease scales. In comparison to standardized means of 0 in the White group, those for t...Continue Reading

References

Oct 1, 1994·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·R D HaysW B Carter
Jan 20, 1999·Geriatric Nephrology and Urology·N G Kutner, G M Devins
Mar 4, 2003·American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation·Antonio Alberto LopesUNKNOWN Worldwide Dialysis Outcomes and Practice Patterns Study Committee
Apr 17, 2004·Kidney International·Mark UnruhUNKNOWN HEMO Study Group
Oct 12, 2005·Archives of Internal Medicine·Robin P HertzElijah Saunders
May 7, 2008·The Journal of Applied Psychology·Adam W MeadePhillip W Braddy
Nov 13, 2017·American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation·John D PeipertRon D Hays
Jan 20, 2018·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Felix FischerAlain Leplège

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