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Table 2 Age of participants included in the “ever” versus “never” case-control study replication, IBM MarketScan Commercial Claims and Encounters Database, 2000–2014

From: Oral contraceptive use and anterior cruciate ligament injury: comparison of active comparator new user cohort and case-control study designs

1 Year Lookback Cases n = 50,215 Controls n = 100,429
Mean (SD) Range Mean (SD) Range
25.6 (10.4) 13, 45 25.6 (10.4) 13, 45
5 Year Lookback Cases n = 11,022 Controls n = 22,044
Mean (SD) Range Mean (SD) Range
23.9 (10.4) 13, 45 23.9 (10.4) 13, 45