The Health Assessment Questionnaire Disability Index is a valid measure of physical function in gout

There are no disability instruments that have specifically been validated for gout. The aim of this study was to determine the construct validity of the Health Assessment Questionnaire Disability Index (HAQ-DI) in gout and the internal validity using Rasch analysis. An observational cohort study of...

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Published in:Clinical and experimental rheumatology 2008-07, Vol.26 (4), p.620-626
Main Authors: TAYLOR, W. J, COLVINE, K, GREGORY, K, COLLIS, J, MCQUEEN, F. M, DALBETH, N
Format: Article
Language:English
Subjects:
Activities of Daily Living
Adult
Aged
Biological and medical sciences
Cohort Studies
Disability Evaluation
Diseases of the osteoarticular system
Female
Gout - physiopathology
Humans
Inflammatory joint diseases
Male
Medical sciences
Metabolic diseases
Middle Aged
Miscellaneous. Osteoarticular involvement in other diseases
Other metabolic disorders
Psychometrics
Purines and pyrimidines (gout, hyperuricemia...)
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container_end_page 626
container_issue 4
container_start_page 620
container_title Clinical and experimental rheumatology
container_volume 26
creator TAYLOR, W. J
COLVINE, K
GREGORY, K
COLLIS, J
MCQUEEN, F. M
DALBETH, N
description There are no disability instruments that have specifically been validated for gout. The aim of this study was to determine the construct validity of the Health Assessment Questionnaire Disability Index (HAQ-DI) in gout and the internal validity using Rasch analysis. An observational cohort study of two groups of clinic patients with gout (n=20, n=53), in which clinical and functional measures were correlated with HAQ-DI scores. Rasch analysis was used to determine the internal validity of summated scores as a measure of physical disability. The HAQ-DI items fitted a Rasch measurement model, confirming internal validity of the scale, although there was evidence of disordered thresholds and rescoring items as a 3-option response rather than a 4-option response improved model fit and resolved the disordered thresholds. HAQ-DI scores showed a bimodal distribution and evidence of floor effects. Clinical indices correlated highly with HAQ-DI scores in gout patients, particularly other measures of physical function. A strong relationship between days of sick leave and HAQ-DI was observed in gout patients (r2=0.44, p
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J ; COLVINE, K ; GREGORY, K ; COLLIS, J ; MCQUEEN, F. M ; DALBETH, N</creator><creatorcontrib>TAYLOR, W. J ; COLVINE, K ; GREGORY, K ; COLLIS, J ; MCQUEEN, F. M ; DALBETH, N</creatorcontrib><description>There are no disability instruments that have specifically been validated for gout. The aim of this study was to determine the construct validity of the Health Assessment Questionnaire Disability Index (HAQ-DI) in gout and the internal validity using Rasch analysis. An observational cohort study of two groups of clinic patients with gout (n=20, n=53), in which clinical and functional measures were correlated with HAQ-DI scores. Rasch analysis was used to determine the internal validity of summated scores as a measure of physical disability. The HAQ-DI items fitted a Rasch measurement model, confirming internal validity of the scale, although there was evidence of disordered thresholds and rescoring items as a 3-option response rather than a 4-option response improved model fit and resolved the disordered thresholds. HAQ-DI scores showed a bimodal distribution and evidence of floor effects. Clinical indices correlated highly with HAQ-DI scores in gout patients, particularly other measures of physical function. A strong relationship between days of sick leave and HAQ-DI was observed in gout patients (r2=0.44, p&lt;0.001). It is concluded that HAQ-DI has good construct and internal validity in gout but a modified scoring approach better fits a Rasch model.</description><identifier>ISSN: 0392-856X</identifier><identifier>EISSN: 1593-098X</identifier><identifier>PMID: 18799093</identifier><language>eng</language><publisher>Pisa: Clinical and Experimental Rheumatology</publisher><subject>Activities of Daily Living ; Adult ; Aged ; Biological and medical sciences ; Cohort Studies ; Disability Evaluation ; Diseases of the osteoarticular system ; Female ; Gout - physiopathology ; Humans ; Inflammatory joint diseases ; Male ; Medical sciences ; Metabolic diseases ; Middle Aged ; Miscellaneous. 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Rasch analysis was used to determine the internal validity of summated scores as a measure of physical disability. The HAQ-DI items fitted a Rasch measurement model, confirming internal validity of the scale, although there was evidence of disordered thresholds and rescoring items as a 3-option response rather than a 4-option response improved model fit and resolved the disordered thresholds. HAQ-DI scores showed a bimodal distribution and evidence of floor effects. Clinical indices correlated highly with HAQ-DI scores in gout patients, particularly other measures of physical function. A strong relationship between days of sick leave and HAQ-DI was observed in gout patients (r2=0.44, p&lt;0.001). 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An observational cohort study of two groups of clinic patients with gout (n=20, n=53), in which clinical and functional measures were correlated with HAQ-DI scores. Rasch analysis was used to determine the internal validity of summated scores as a measure of physical disability. The HAQ-DI items fitted a Rasch measurement model, confirming internal validity of the scale, although there was evidence of disordered thresholds and rescoring items as a 3-option response rather than a 4-option response improved model fit and resolved the disordered thresholds. HAQ-DI scores showed a bimodal distribution and evidence of floor effects. Clinical indices correlated highly with HAQ-DI scores in gout patients, particularly other measures of physical function. A strong relationship between days of sick leave and HAQ-DI was observed in gout patients (r2=0.44, p&lt;0.001). 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source Freely Accessible Science Journals - check A-Z of ejournals
subjects Activities of Daily Living
Adult
Aged
Biological and medical sciences
Cohort Studies
Disability Evaluation
Diseases of the osteoarticular system
Female
Gout - physiopathology
Humans
Inflammatory joint diseases
Male
Medical sciences
Metabolic diseases
Middle Aged
Miscellaneous. Osteoarticular involvement in other diseases
Other metabolic disorders
Psychometrics
Purines and pyrimidines (gout, hyperuricemia...)
title The Health Assessment Questionnaire Disability Index is a valid measure of physical function in gout
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