Sherrilene Classen, Yanning Wang, Alexander M. Crizzle, Sandra M. Winter, Desiree N. Lanford; Predicting Older Driver On-Road Performance by Means of the Useful Field of View and Trail Making Test Part B. Am J Occup Ther 2013;67(5):574-582. doi: 10.5014/ajot.2013.008136.
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The Useful Field of View® (UFOV) and Trail Making Test Part B (Trails B) are measures of divided attention. We determined which measure was more accurate in predicting on-road outcomes among drivers (N = 198, mean age = 73.86, standard deviation = 6.05). Receiver operating characteristic curves for the UFOV (Risk Index [RI] and Subtests 1–3) and Trails B significantly predicted on-road outcomes. Contrasting Trails B with the UFOV RI and subtests, the only difference was found between the UFOV RI and Trails B, indicating the UFOV RI was the best predictor of on-road outcomes. Misclassifications of drivers totaled 28 for the UFOV RI, 62 for Trails B, and 58 for UFOV Subtest 2. The UFOV RI is a superior test in predicting on-road outcomes, but the Trails B has acceptable accuracy and is comparable to the other UFOV subtests.
Sensitivity is the predictor test’s ability to obtain a positive test (failing the on-road test) when the condition really exists (a true positive).
Specificity is the predictor test’s ability to obtain a negative result (passing the on-road test) when the condition is really absent (a true negative).
PPV is the probability that the participant will, given a certain cutpoint on the predictor test, fail the on-road test.
NPV is the probability that the participant will, given a cutpoint on the predictor test, pass the on-road test.
The number of false positives (those who receive a failing score but pass the on-road test) and false negatives (those who receive a passing score but fail the on-road test) and the sensitivity and specificity values change with a different cutoff value (Streiner & Cairney, 2007).
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