FIGURE 1.

Cohort identification periods and numbers of eligible oral hypoglycemic agent users in the Integrated Medical Database of National Taiwan University Hospital. Solid lines represent the oral hypoglycemic agent (OHA) user identification periods; dotted lines represent the baseline periods of interest, and dashed lines represent the follow-up periods of interest. Baseline and follow-up periods were defined based on the first OHA prescription (i.e., the index date) observed in the OHA user identification period. Data continuity was assessed during the baseline and follow-up periods of interest. We defined patients as having continuous data if they had at least one encounter or prescription in the electronic health record database within a given 90-day interval.