H.H.LIM1, Y.H LIM1, H. LEE1
Tan Tock Seng Hospital1
Touchscreen DriveSafe and DriveAware (tDSDA) is a touchscreen assessment tool to predict for safe and unsafe driving among older and/or cognitively impaired drivers (Kay, Bundy & Clemson, 2009; Hines & Bundy, 2014). However, tDSDA’s predictive validity has not been established locally. The aim of this study is to examine the validity of tDSDA in predicting the on-road driving performance of drivers with medical conditions in Singapore.
A prospective observational study was conducted. One hundred participants were recruited using purposive sampling. All participants completed the tDSDA before their on-road assessment. Both assessors and participants were double-blinded to the tDSDA results during on-road assessment. Descriptive statistics were used to summarise the data. Diagnostic accuracy analyses were performed to compare touchscreen DSDA results against on-road driving assessment outcomes.
Two of the 100 participants were excluded due to incompletion of on-road assessment. Among the remaining 98 participants, 88.8% were male with a mean age 56.6years. The mean duration of driving experience was 28.3 years. 93.8% of them had a neurological condition (e.g. stroke).
The sensitivity, specificity, positive predictive value and negative predictive value comparing tDSDA outcome and the drivers’ on-road assessment outcome was 25.0%, 97.6%, 33.3% and 96.5% respectively.
The tDSDA specificity was consistent when compared with previous validity studies. The tDSDA has high specificity to predict drivers who will pass on-road assessment but not those who will fail on-road assessment. This is similar to other studies which concluded that there is no one clinical standardised assessment that can be predict one’s on-road assessment.