From: Family history of venous thromboembolism is a risk factor for venous thromboembolism in combined oral contraceptive users: a nationwide case-control study
OR (95Â % CI)
Estimated OR
Contraceptives
2.12 (1.84-2.44)
Users of COC for more than 6Â months
Ref
New Users of COC
1.67 (1.33-2.09)a
3.53 (2.56-4.36)