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Table 2 λS and sib-sib OR (with 95% CI) for PPROM.

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: PPROM 2105 1311 763
Population: N 254740 211308 39190
Population risk 0.008 (0.008–0.008) 0.006 (0.006–0.006) 0.019 (0.018–0.020)
Siblings: sibpairs with both siblings affected 88 37 49
Siblings: sibpairs with first sibling affected 1300 883 393
Sibling risk 0.068 (0.054–0.082) 0.042 (0.029–0.055) 0.125 (0.092–0.158)
λS 8.2 (6.5–9.9) 6.8 (4.6–8.9) 6.4 (4.7–8.1)
Sib-sib unadjusted OR (95% CI) 10.8 (8.6–13.5) 8.8 (6.3–12.4) 8.8 (6.4–12.1)
Sib-sib adjusted OR (95% CI)# 9.6 (7.6–12.2) 8.5 (6.0–12.1) 8.9 (6.4–12.5)
  1. #Adjusted for mother < 20 years old, mother < 12 education, Medicaid (index of low SES), no prenatal care, mother BMI < 20 kg/m2, cigarette smoking