Table 1.

Cohort construction

Criteria	Number of unique adults
	2012	2013	2014	Total
Aged 19–64 years	33,431,239	27,591,388	29,913,349	50,807,486
Had continuous health plan enrollment (no gap of > 45 days) for at least one year (365 days) before January 1st and at least one day since January 1st	24,402,729	18,802,142	20,338,835	35,696,718