The psychometric properties of the Evaluation of Daily Activity Questionnaire in seven musculoskeletal conditions

Purpose: To psychometrically test the Evaluation of Daily Activity Questionnaire in sevenmusculoskeletal conditions. Materials and Methods: 1200 people with: ankylosing spondylitis; osteoarthritis; systemiclupus erythematosus; systemic sclerosis; chronic pain; chronic upper limb disorders; orPrimary Sjögren’s syndrome completed the Evaluation of Daily Activity Questionnaire,Health Assessment Questionnaire and Short-Form Health Survey v2. We examined internalconstruct validity using Rasch analysis, internal consistency, concurrent validity with theHealth Assessment Questionnaire and Short-Form Health Survey v2. Participants repeatedthe Evaluation of Daily Activity Questionnaire to assess test-retest reliability. Results: The 12 domains satisfied Rasch model expectations for fit, local dependency,unidimensionality and invariance by age and gender, in each musculoskeletal condition.Internal consistency was consistent with individual use (Cronbach’s alpha >0.90); concurrentvalidity was strong (Health Assessment Questionnaire: rs =0.60 to 0.92; Short-Form Health Survey v2 Physical Function: rs = -0.61 to -0.91) and test-retestreliability excellent (Intra-Class Correlation Coefficient(2,1) = 0.77 to 0.96). Conclusion: The Evaluation of Daily Activity Questionnaire satisfied Rasch modelrequirements for construct validity and has good reliability and validity in each MSC. TheEvaluation of Daily Activity Questionnaire can be used as a measure of everyday activity inpractice and research with people with musculoskeletal conditions