Reliability and validity of the performance quality rating scale (PQRS) in individuals with chronic stroke: A psychometric study

Introduction: The Performance Quality Rating Scale (PQRS) is an observational assessment tool designed to evaluate the quality of task performance in a client-centered context. This study aimed to evaluate the psychometric properties of the generic version of the Performance Quality Rating Scale (PQRS-G) in individuals with chronic stroke. Method: This psychometric study utilized baseline data extracted from the preintervention phase of a randomized controlled trial (RCT) involving 60 adults with chronic stroke (⩾6-months postonset). Inter-rater reliability and convergent validity with the Canadian Occupational Performance Measure (COPM) were assessed. Results: The PQRS-G demonstrated excellent inter-rater reliability across all self-selected goals, with a single-measure intraclass correlation coefficient of 0.958 (95% CI: 0.929–0.975). Convergent validity was supported by strong correlations between PQRS-G scores and COPM scores (Spearman’s rho = 0.827 for performance; rho = 0.870 for satisfaction, p < 0.001). The standard error of measurement (SEM) was 0.29, and the minimal detectable change at the 95% confidence level (MDC 95 ) was 0.80. Conclusions: The PQRS-G exhibits robust psychometric properties in individuals with chronic stroke, supporting its use as a reliable and valid observational tool for assessing performance quality in client-centered rehabilitation. Trial registration: Hidden for peer review.