Although most (60%) middle-aged male drivers reported no collisions, these findings suggest that vehicular collisions and citations do not decrease with maturation for male drivers with ADHD. Additional research is needed for replication and to explore causal factors. For example, higher collision rates among young women may in part be due to greater cell phone use and text messaging (3). This study design was limited by its cross-sectional, self-report, and nonrandomized nature. For example, there may be a cross-sectional cohort effect, where older men might be more reckless drivers in general and less likely to use ADHD medication. However, this sample is unique in its size, age range, number of women, and geographic scope.