Rasch analysis suggests that health assessment questionnaire II is a generic measure of physical functioning for rheumatic diseases: a cross-sectional study

Health and Quality of Life Outcomes
William J Taylor, Ketna Parekh

Abstract

Versions of the Health Assessment Questionnaire (HAQ) are commonly used to measure physical functioning across multiple rheumatic diseases but there has been no clear demonstration that any HAQ version is actually generic. This study aimed to show that the HAQ-II instrument is invariant across different rheumatic disease categories using the Rasch measurement model, which would confirm that the instrument is generic. HAQ-II responses from 882 consecutive rheumatology clinic attendees were fitted to a Rasch model. Invariance across disease was assessed by analysis of variance of residuals implemented in RUMM2030. Rasch modeled HAQ-II scores across disease categories were compared and the mathematical relationship between raw HAQ-II scores and Rasch modeled scores was also determined. The HAQ-II responses fitted the Rasch model. There was no substantive evidence for lack of invariance by disease category except for a single item ("opening car doors"). Rasch modeled scores could be accurately obtained from raw scores with a cubic formula (R2 0.99). Patients with rheumatoid arthritis had more disability than patients with other kinds of inflammatory arthritis or autoimmune connective tissue disease. The HAQ-II can be used across di...Continue Reading

References

Apr 2, 2008·Psychiatric Services : a Journal of the American Psychiatric Association·George J UnickWilliam Hargreaves
Oct 13, 2009·The Journal of Rheumatology·H Ralph SchumacherFernando Perez-Ruiz
Jul 3, 2010·The Journal of Rheumatology·Ketna Parekh, William J Taylor
Oct 16, 2010·Disability and Rehabilitation·Nenad KostanjsekT Bedirhan Üstün
May 12, 2011·Arthritis Care & Research·Kenneth Tang, UNKNOWN Canadian Arthritis Network Work Productivity Group
Jul 5, 2011·The Journal of Rheumatology·Peter A MerkelRaashid A Luqmani
Apr 14, 2016·Central European Journal of Public Health·Olga ŠvestkováKarla Kotková
Apr 1, 2015·Educational and Psychological Measurement·David Andrich, Curt Hagquist

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Citations

Dec 14, 2018·BMJ Supportive & Palliative Care·Mark Howard, Christina Ramsenthaler

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Software Mentioned

SPSS
Power
RUMM
RUMM2030

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