Table and Figure headings:
Table 1. Demographic and clinical characteristics compared between placental abruption cases and controls. Clinical characteristics are specific to the pregnancy affected by placental abruption.
Table 2. Results from primary analysis of familial risk of placental abruption.
*Variables adjusted for include age, year of pregnancy, race, ethnicity, education level, and parity.
Table 3. Results from sensitivity analysis of familial risk of placental abruption excluding cases with “antepartum bleeding”.
*Variables adjusted for include age, year of pregnancy, race, ethnicity, education level, and parity.
Table 4. Clinical risk factors with estimated odds ratios associated with placental abruption.
Table 5. Results from subgroup analysis of familial risk of placental abruption adjusting for demographic and clinical risk factors.
*Demographic variables adjusted for include age, year of pregnancy, race, ethnicity, education level, and parity. Clinical variables included smoking, diabetes, uterine anomaly, hypertension, and pre-labor rupture of membranes (PROM) in the pregnancy affected by placental abruption, and cesarean delivery in a prior pregnancy.