Oral contraceptive use and risk of myocardial infarction Distribution of 251 cases of acute myocardial infarction (AMI) and 475 controls and odds ratios (with 95% confidence intervals, CI) according to oral contraceptive (OC) use.Italy, 1983-92. AMI ControlsOdds ratios * (95% CI)No(%) No (%) RRI RR2OC use: Never users 201 (80-1) 423 (89-1) it it Ever users 50 (19-9) 52 (10-9) 2-2 (1-4, 3-4) [1][2][3][4][5][6][7] (1-1, 3-1) Current users 7 (2-8) 6 (1-3) 2-9 (0 9, 9-3) 2-0 (0-6, 6-7)Past users 43 (17-1) 46 (9 7) 2-1 (1-3, 3 4) 1-8 (1-0, 3-2) Duration of use:.2 years 23 (9 2) 25 (5-3) 2-1 (1-1, 3-9) 21 (1-0, 4 4) > 2 years 27 (10-8) 27 (5 7) 2-3 (1-3, 4-0) 1-5 (0-7, 2-9)
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Meinert et al. (1994) studied this question.