Demographically-adjusted norms for Rey-Osterrieth Complex Figure Test (RCFT) for Sri Lankan adults

Objective: The aim of this study was to create demographically-adjusted norms for Rey-Osterrieth Complex Figure Test (RCFT) for Sri Lankan adults. Method: Four-hundred and twenty-two healthy, adult participants (age: 19-83 years, education: 5-23 years, 202 men) underwent the RCFT copy, 3-min and 30-minute-recall trials. Age- and education-stratified percentile-based norms and demographically-adjusted regression-based norms were created for copy-trial scores and recall trial scores, respectively. Results: There was a ceiling effect of the copy scores where the maximum possible score (i.e. 36) reached between 25th and 90th percentile depending of the age and the education band. Age, years of education and sex accounted for 25.0% of the variance of the RCFT 3-min-recall scores (adjusted R² = 0.25, p < .0001). The age and years of education explained 25.1% of the variance of the 30-minute recall score (adjusted R² = 0.251, p < .0001). Age accounted for 7%-8% and years of education accounted for 10%-11% of the variances of the recall trial scores. Sex only affected the 3-min recall scores and accounted for only about 1% of the variance. No significant differences in RCFT scores were observed among different ethnic groups. Conclusions: These RCFT norms for Sri Lankan adults fill a hiatus in neuropsychological assessment of visuospatial construction and visual memory. The percentile tables and accompanying software-based calculator with embedded regression equations help clinicians more readily interpret individual test results and account for the RCFT performance variability introduced by demographic variables.