Incidence rate, age-adjusted and confounder-adjusted rate ratio of venous thromboembolism (VTE) during the puerperal period for women hospitalized more than one day during pregnancy according to six various causes of admission.

aIncidence per 10,000 women-years at risk.bRate ratio adjusted for age, calendar-year, educational status, thrombophilia, anticoagulation treatment, medical diseases, assisted reproductive treatment.cHyperemesis, infection, intrauterine growth restriction, intrauterine fetal death, bleeding episode, abruptio placentae, placenta previa, threatened preterm labor, preterm premature rupture of membranes and preeclampsia.dIntrauterine growth restriction or intrauterine fetal death,eBleeding episode in pregnancy, abruptio placentae or placenta previa.fThreatened preterm labor, preterm premature rupture of membranes.