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  • Title: Does incorporation of aids and devices make a difference in the score of the health assessment questionnaire-disability index? Analysis from a scleroderma clinical trial.
    Author: Khanna D, Clements PJ, Postlethwaite AE, Furst DE.
    Journal: J Rheumatol; 2008 Mar; 35(3):466-8. PubMed ID: 18085737.
    Abstract:
    OBJECTIVE: The Health Assessment Questionnaire-Disability Index (HAQ-DI) is a commonly used musculoskeletal-targeted measure in systemic sclerosis (SSc). We assessed if HAQ-DI scores are different when calculated with and without aids/devices, and if apparent responsiveness changes when scored in these 2 ways. METHODS: We used data from a placebo-controlled clinical trial in diffuse SSc. Baseline HAQ-DI total score was calculated with and without aids/devices and compared using Student's t-test. We also classified the HAQ-DI scores into no-to-mild disability (0.00-1.00), moderate disability (1.01-2.00), and severe disability (2.01-3.00). Responsiveness to change was evaluated using the effect size (ES). RESULTS: The mean (SD) baseline HAQ-DI score was 1.33 (0.68) with aids/devices compared to HAQ-DI score 1.16 (0.70) without aids/devices (p = 0.03). When the baseline HAQ-DI score was categorized into no-to-mild, moderate, and severe disability, the proportion of patients in the no-to-mild disability (29% with aids/devices vs 44% without aids/devices) and moderate disability (59% with aids/devices vs 45% without aids/devices) groups were statistically different (p <0.001). The ES was similar between the 2 groups (ES = 0.01 and 0.02 with and without aids/devices). CONCLUSION: This analysis suggests a shift from no-to-mild disability to moderate disability when aids/devices are incorporated in total HAQ-DI score. Future clinical trials in SSc should explicitly state whether HAQ-DI score was calculated using aids/devices.
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