Rasch analysis of the Dutch health assessment questionnaire disability index and the health assessment questionnaire II in patients with rheumatoid arthritis

Abstract Objective The Health Assessment Questionnaire (HAQ) disability index (DI) is the most common self‐reported measure of physical disability in rheumatoid arthritis (RA). Recently, the HAQ‐II was developed in the US as a short, valid, and reliable alternative using Rasch analysis. Our objective was to compare the scaling properties of the HAQ DI and HAQ‐II in Dutch patients with RA. Methods We used data from 472 patients with confirmed RA. Internal construct validity of the HAQ versions was assessed using Rasch analysis. Additionally, external construct validity was assessed by examining... Mehr ...