Figure 2. The Definition of 3 Nonoverlapping Time Periods to Capture the Current, Recent, and Past Effects of Drug Use on Aneurysmal Subarachnoid Hemorrhage Incidence.

Time periods are defined as follows: current (within 3 months before index date), recent (between 1 year before index date and 3 months before index date), and past (between January 1, 2000, and 1 year before index date).