An evaluation of the Digit Symbol component of the Russell, Neuringer, and Goldstein Average Impairment Rating

Used WAIS subtest scores of 65 brain-damaged (mean age 39.57 yrs) and 50 control (mean age 38.6 yrs) Ss to assess the validity of the Digit Symbol component of the Average Impairment Rating as an indicator of cerebral impairment. The mean impairment rating obtained by the brain-damaged Ss was significantly higher than that of the control Ss, and examination of individual scores showed that the component correctly identified 72% of all Ss. The component, however, misclassified 40% of the control Ss as impaired. (5 ref)