This figure depicts the proportion of patients with an index fill in 2010 meeting the continuous enrollment and continuous enrollment plus washout criteria across look-back periods of increasing duration. Panels (A), (B), and (C) represent incident user cohort size changes across look-back periods for antihyperlipidemic, antidiabetic, and antidepressant user cohorts, respectively. Note: There were a total of 3,477,753 antihyperlipidemic, 1,445,651 antidiabetic and 3,468,137 antidepressant users aged 18–64 years in calendar year 2010.