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Concurrent validity of the Health Assessment Questionnaire Disability Index in Scleroderma
Abstract
Objective:
To establish the concurrent validity of the Health Assessment Questionnaire (HAQ) Disability Index in systemic sclerosis (SSc; scleroderma).
Methods:
Eighty subjects with SSc completed the HAQ Disability Index questionnaire. An occupational therapist, who was blind to the subjects' responses, observed each subject's performance on 10 of the items.
Results:
Paired t-tests showed significant differences between the observer and subjects' responses for tying shoes, buttoning, gripping, and walking. Intra-class correlations between observer and subjects ranged from 0.38 to 0.76.
Conclusion:
The results support the validity of the HAQ Disability Index in patients with systemic sclerosis.