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Table 4 Adjusted relative risk (95% confidence interval) for placenta previa by missing paternal age and race, stratified by maternal race and age

From: Uteroplacental bleeding disorders during pregnancy: do missing paternal characteristics influence risk?

Paternal characteristics Maternal age (years)
  <20 20–24 25–29 30–34 ≥35
  White women
Age missing 0.79 (0.54, 1.16) 1.39 (1.14, 1.68) 1.01 (0.82, 1.24) 1.01 (0.82, 1.24) 1.12 (0.91, 1.38)
Race missing 1.02 (0.76, 1.37) 1.27 (1.08, 1.49) 0.98 (0.83, 1.15) 0.95 (0.81, 1.11) 1.18 (1.02, 1.36)
Both missing 1.08 (0.98, 1.19) 1.10 (1.03, 1.18) 1.10 (1.03, 1.18) 1.09 (1.01, 1.17) 1.06 (0.97, 1.14)
  Black women
Age missing 1.27 (0.79, 2.04) 1.11 (0.79, 1.57) 0.91 (0.64, 1.28) 0.98 (0.71, 1.37) 0.93 (0.66, 1.31)
Race missing 0.77 (0.39, 1.48) 0.82 (0.56, 1.21) 0.86 (0.61, 1.22) 1.25 (0.94, 1.68) 1.34 (0.99, 1.78)
Both missing 1.02 (0.89, 1.17) 0.95 (0.87, 1.04) 0.94 (0.86, 1.03) 0.99 (0.89, 1.10) 0.97 (0.87, 1.09)
  1. RRs were adjusted for parity, maternal education, prenatal care, marital status, smoking during pregnancy, chronic hypertension, and prior cesarean delivery and were derived in comparison to "Complete" as the reference group.