Prediction of brain damage severity: demographic corrections

This study investigated the value of using age and education corrections to the Alternative Impairment Index (AII), to predict the severity of brain damage on the General Neuropsychological Deficit Score (GNDS) and the Halstead Impairment Index (HII). A sample of 40 normal, psychiatric and brain-damaged subjects who had been administered the HRNTB was obtained and the AII, GNDS and HII were calculated for each subject. Hit rates for agreement on level of severity, after correction for age and education effects, for the GNDS and AII were 52.5% and for the AII and HII were 47.5%. Examination of the data suggested that AII, after correction for age and education effects, reflects severity of brain damage at a chance level on both the HII and on the GNDS.