Trail Making Test norms for psychiatric patients.

The Trail Making Test was administered to a sample of 661 inpatients in a publicly supported psychiatric hospital. The patients' mean IQ of 83.7 (SD = 13.0) was in the low end of the low average range. Multiple regression analysis of the scores showed significant IQ and age components of Trail Making Test scores; however, education and gender differences in performance were not significant once IQ and age were factored into the regression equation. Ability-based norms using time in seconds to completion as the score and IQ as a moderator variable are presented. Such norms allow more appropriate evaluation of the differential cognitive functioning of this population than previously published norms. Normal standard score conversions from raw scores, the intercept, regression weights for IQ and age, and standard error of the regression for both the Trails tasks are provided for individuals desiring to write a program to provide scores corrected for IQ and age.