Table 1. Sample Characteristics of Included Patients With Attention-Deficit/Hyperactivity Disorder (ADHD).

Variable	Male	Female
No. of patients	1 121 053	1 198 397
Diagnosis of ADHD, No. (%)	781 581 (69.7)	758 809 (63.3)
≥1 Prescription of ADHD medication, No. (%)	902 492 (80.5)	1 043 706 (87.1)
≥1 Medication status switch, No. (%)	591 679 (52.8)	666 438 (55.6)
≥1 ED visit for an MVC event, No. (%)	5261 (0.5)	5963 (0.5)
Age at start of follow-up, median (IQR), y	27 (20-40)	32 (22-44)
Follow-up, median (IQR), mo	14 (8-29)	14 (7-29)

Abbreviations: ED, emergency department; IQR, interquartile range; MVC, motor vehicle crash.