Stockholm, Sweden—An observational study suggests that attention-deficit/hyperactivity disorder (ADHD) patients who take their medications have a lower risk of motor vehicle crashes. The article in JAMA Psychiatry found that, in the within-individual analyses, male patients with ADHD had a 38% lower risk and female patients had a 42% lower risk of MVCs in months when receiving ADHD medication. Karolinska Institutet–led researchers note that similar reductions were found across all age groups, across multiple sensitivity analyses, and when considering the long-term association between ADHD medication use and MVCs. In fact, they suggest that as many as 22.1% of the MVCs in patients with ADHD could have been avoided if they had received medication during the entire follow-up. The study was based on data involving 2.3 million U.S. patients with ADHD between 2005 and 2014 from commercial health insurance claims and identified emergency department visits for MVCs.