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Incidence of venous thromboembolism (number of cases per 100 000) among all users of combined oral contraceptives in six studies
| Study | Incidence | No of cases: No of woman years |
|---|---|---|
| Farmer et al 19972 | 41 | 83:202 517 |
| Pini et al, 19963 | 62 | 37:59 603 |
| Jick et al, 19954 | 23.2 | 75:323 888 |
| Gerstman et al, 19905 | 5 | 94:177 607 |
| Vessey et al, 19866 | 39 | 3:7606 |
| Porter et al, 19857 | 8 | 3:37 807 |
