Psychometric Properties of the Outpatient Physical Therapy Improvement in Movement Assessment Log (OPTIMAL) in Patients With Musculoskeletal Disorders: A Replication Study With Additional Findings

BACKGROUND: The Outpatient Physical Therapy Improvement in Movement Assessment Log (OPTIMAL) is a recently developed self-report outcome instrument designed to measure the extent of activity limitation as defined by the World Health Organization. OBJECTIVE: The purposes of the study were to replicate some aspects of the original study of the OPTIMAL Difficulty and Confidence scales and to conduct additional psychometric tests.