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Table 3 Crude and adjusted relative risks of fetal and neonatal outcomes stratified by risk and model of antenatal care

From: Antenatal care packages with reduced visits and perinatal mortality: a secondary analysis of the WHO Antenatal Care Trial

High maternal risk group (n = 5,125)
End points New model Standard model Crude relative risk (95% CI)*0 Adjusted relative risk (95% CI)*
N (%) N (%)
Perinatal mortality 91/2713 (3.35) 71/2412 (2.94) 1.00 (0.85 – 1.17) 0.94 (0.79 – 1.12)
Fetal death 65/2713 (2.40) 36/2412 (1.49) 2.12 (1.53 - 2.94) 1.78 (1.33 – 2.39)
Fetal death with GA <=36 weeks 51/2713 (1.9) 26/2412 (1.1) 1.77 (1.48 – 2.10) 1.48 (1.17 – 1.89)
Neonatal deaths 26/2648 (1.0) 35/2376 (1.5) 0.48 (0.31 – 0.72) 0.47 (0.30 – 0.72)
Low maternal risk group (n=17,668)
End points New model Standard model Crude relative risk (95% CI)* 0 Adjusted relative risk (95% CI)*
N (%) N (%)
Perinatal mortality 143/8959 (1.60) 119/8709 (1.37) 1.14 (0.90, 1.44) 1.24 (0.95, 1.63)
Fetal death 96/8959 (1.07) 83/8709 (0.95) 1.18 (0.91 – 1.52) 1.26 (0.91 – 1.73)
Fetal death with GA <=36 weeks 71/8959 (0.8) 51/8709 (0.6) 1.48 (1.08 – 2.04) 1.56 (1.05 – 2.31)
Neonatal deaths 47/8863 (0.5) 36/8626 (0.4) 1.38 (0.89 – 2.14) 1.35 (0.87 – 2.10)
  1. * Relative risks adjusted for clustering within clinics.
  2. 0 Model adjusted for risk strata only.
  3. † Model in high-risk women adjusted for risk strata, married or stable union, hospital admission in last pregnancy, previous surgery on reproductive tract, previous low birth weight and vaginal bleeding in the first trimester.
  4. ‡ Model in low-risk women adjusted for risk strata, married or stable union, smoking, education less than primary, late booking, age, primigravidity and previous abortion.