Reliability and validity of the Canadian Occupational Performance Measure in stroke patients

Abstract

Objective: To research test-retest reliability and discriminant validity of the Canadian Occupational Performance Measure (COPM), a client-centred outcome measure, in stroke patients.

Design: The COPM was administered twice with a mean interval of eight days (SD 2.5, range 5-16). On both occasions the patient identified a maximum of five problems in daily activities. The problems of both interviews were compared. The problems identified during the first COPM were rated by the patient on a performance and satisfaction rating scale on both occasions. The individually identified items with use of the client-centred COPM were compared with the fixed items of standardized measures (Barthel Index, Frenchay Activities Index, Stroke Adapted Sickness Impact Profile-30, Euroqol 5D and Rankin Scale).

Setting: Patients were interviewed at their place of residence.

Subjects: Twenty-six stroke patients participated, 11 men and 15 women, aged from 26 to 83 years (mean 68, SD 15). Twenty-four patients were six months, two patients were two months post stroke.

Results: Of the 115 problems identified during the first COPM, 64 (56%) were also identified the second time. Correlation coefficients for the scores were 0.89 (p < 0.001) for performance and 0.88 (p < 0.001) for satisfaction. Of the individual problems identified with the COPM, 25% or less were present in the standardized measures. Correlations between the scores on the COPM and the standardized measures were low and nonsignificant, while all standardized measures correlated significantly with each other.

Conclusions: Test-retest reliability of the COPM was moderate for the item pool but was good for the performance and satisfaction scores. Discriminant validity was confirmed. Many patient-unique problems identified with the COPM were not evaluated by standardized measures.