Comparing Novel and Legacy Health Assessment Questionnaire Scoring Methods: A Scleroderma Patient-centered Intervention Network Cohort Study

IRTree-based scoring is a novel approach that incorporates information from all HAQ items and whether participants use aids, devices, or assistance. Its association with external measures, however, did not differ from the standard HAQ-DI. HAQ-DI scoring is easy to implement, and extensive comparative data are available, making it the preferred scoring method.