Interrater Reliability of the Revised Cognitive Performance Test (CPT): Assessing Cognition in People With Neurocognitive Disorders.

The rigor of occupation-based standardized assessments that rely on observational scoring procedures depends on proven reliability among test administrators. This study measured interrater reliability of the Cognitive Performance Test (CPT), a standardized, occupation-based assessment that measures cognitive-functional capacity in older adults with neurocognitive disorders. To capture a range of experience among test administrators, two sets of raters-four expert and three novice-scored video recordings of 10 patients administered the CPT. Interrater reliability results were strong among all raters (intraclass correlation coefficient [ICC] = .93), with expert raters (ICC = .97) yielding higher coefficients than novice raters (ICC = .93). Spearman's ρ correlation coefficients were high among all raters (rs = .92-1.00). Practitioners can be confident that results of the CPT give accurate and consistent information to the health care team, family members, and patients when administered with fidelity using standardized protocols.