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Table 3 λS and sib-sib OR (with 95% CI) for placental abruption.

From: Population-based estimate of sibling risk for preterm birth, preterm premature rupture of membranes, placental abruption and pre-eclampsia

  All races White Black
Population: placental abruption 2050 1579 428
Population: N 268002 220641 42888
Population risk 0.008 (0.008–0.008) 0.007 (0.007–0.007) 0.010 (0.009–0.011)
Siblings: sibpairs with both siblings affected 34 30 4
Siblings: sibpairs with first sibling affected 1124 851 245
Sibling risk 0.030 (0.020–0.040) 0.035 (0.023–0.047) 0.016 (0–0.032)
λS 4.0 (2.6–5.3) 4.9 (3.2–6.7) 1.6 (0.0–3.2)
Sib-sib unadjusted OR (95% CI) 4.1 (2.9–5.8) 5.4 (3.8–7.9) 1.4 (0.5–3.7)
Sib-sib adjusted OR (95% CI)# 3.8 (2.6–5.5) 5.0 (3.4–7.4) 1.2 (0.4–3.9)
  1. #Adjusted for mother < 20 or > 35 years old, mother < 12 education, Medicaid (index of low SES), no prenatal care, mother BMI < 20 kg/m2, cigarette smoking, insulin-dependent diabetes mellitus, chronic hypertension, hydraminos/oligohydraminos