A Clinically Significant Difference on the COPM: A Review.

The Canadian Occupational Performance Measure (COPM) assists occupational therapists to identify occupational performance problems using a client-centred approach. Since its first publication in 1991, there has been abundant evidence of the ability of the COPM to detect a significant difference as an outcome measure. There has also been a tacit understanding that a difference of 2 points from pre-test to post-test on either Performance or Satisfaction COPM score represents a clinically significant difference.