Predictive Validity of the WAIS-Ⅲ as a Driving Skill in Individuals with Brain Injury / The Japanese Journal of Rehabilitation Medicine

ABSTRACT

Objective：We aimed to examine the clinical validity of the Wechsler Adult Intelligence Scale (WAIS)-III for resuming automobile driving in patients with brain injury.Methods：A total of 71 patients who requested to resume driving after brain injuries were included, with 43 and 28 patients categorized in the resumed and non-resumed driving groups, respectively. Statistical analysis was performed by comparing the sub-items of the WAIS-III between the groups. The reference value of accurate determinants was estimated using receiver operating characteristic (ROC) curve analysis.Results：The results of the ROC curve analysis showed that the areas under the curves for full-scale intelligence quotient (FIQ), performance IQ (PIQ), and perceptual organization index (POI) were higher than 0.7 (with moderate predictive accuracy). The cutoff values were as follows with high specificity and low sensitivity：PIQ, 98.5；FIQ, 107；and PO, 107.Conclusion：The cutoff values of the FIQ, PIQ, and POI of the WAIS-III were inadequate predictors for resumption of driving in patients with brain injury. However, if patients had all three scores less than 70, it was suggested that they refrain from driving.