The reliability of the Danish version of the Canadian Occupational Performance Measure

This study aims to assess the reliability of the Danish version of the Canadian Occupational Performance Measure (COPM).

151 clients, 42.4% male, mean age 66.9 years (SD: 14.4, range: 16-90), from two hospitals and two rehabilitation centres were interviewed twice with the COPM over a ten-day mean interval (SD: 4.9, range: 2-27) either by the same (intra-rater) or two different occupational therapists (inter-rater). Data were analysed with intra-class correlation coefficients, coefficient of repeatability, and Bland-Altman plots.

823 occupational performance issues were prioritized of which 41%, 338 occupational performance issues (95% CI: 37.7-44.5), were mentioned in both interviews. The intra-class correlation coefficients were 59.8 (95% CI-intra-class correlation coefficients: 49.3-69.5) (COPM), 73.5 (95% CI intra-class correlation coefficients: 65.5-80.2) (COPM-Performance), and 71.8 (95% CI intra-class correlation coefficients: 63.4-78.8) (COPM-Satisfaction). The limits of agreement were -2.83 to 3.05 for the COPM-Performance and -3.50-3.53 for the COPM-Satisfaction. The COPM-Importance scores were highest when obtained by two raters, but opposite for the scores of the COPM-Performance and COPM-Satisfaction. The coefficient of repeatability roughly showed a change in +/- three points (COPM-Importance: 2.67; COPM-Performance: 2.94; and COPM-Satisfaction: 3.52). Correspondingly, Bland-Altman plots showed limits of agreement for the mean values of -2.71 and 3.53, respectively.

The intra-rater and inter-rater reliability of the COPM were moderate across settings, clients and rater experiences.