Estimating the risk of venous thromboembolism (VTE) associated with combined hormonal contraceptives following early terminated pregnancies or birth, a Danish nationwide retrospective cohort observing a one-year follow-up was defined using three unique registries. All Danish women with confirmed pregnancies aged 15-49 during the period of 1995-2009 were… (More)
Table 3: Estimated numbers needed to harm (NNH). Detecting the effects of combined hormonal contraceptives during the indicated time intervals (weeks) for groups with different pregnancy outcomes. NNH = 1/(incidence rate of combined hormonal contraceptive users – incidence rate of non-users).