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Table 3 Adjusted odds ratios for adverse outcomes, by reproductive health risk factor categories

From: The associations of parity and maternal age with small-for-gestational-age, preterm, and neonatal and infant mortality: a meta-analysis

  Nulliparous / Age <18 Nulliparous / Age 18-<35 Parity ≥3 / Age 18-<35 Parity ≥3 / Age ≥35
Outcome N* aOR 95% CI N* aOR 95% CI N* aOR 95% CI N* aOR 95% CI
SGA (reference: AGA) 14 1.80 1.62, 2.01 14 1.51 1.39, 1.64 14 0.92 0.86, 0.99 13 0.98 0.87, 1.09
Preterm (reference: term) 14 1.52 1.40, 1.66 14 1.09 0.99, 1.21 14 1.20 1.06, 1.35 12 1.43 1.21, 1.69
Term-SGA (reference: term-AGA) 14 1.81 1.51, 2.16 14 1.64 1.46, 1.85 14 0.88 0.81, 0.96 13 1.06 0.93, 1.20
Preterm-AGA (reference: term-AGA) 13 1.75 1.56, 1.98 13 1.30 1.09, 1.54 13 1.13 0.98, 1.30 12 1.39 1.16, 1.65
Preterm-SGA (reference: term-AGA) 11 3.14 2.18, 4.53 14 2.67 1.97, 3.61 13 1.07 0.83, 1.38 12 1.24 1.06, 1.44
Neonatal Mortality 12 2.07 1.69, 2.54 13 1.28 1.07, 1.51 12 1.30 1.11, 1.51 10 1.66 1.23, 2.23
Infant Mortality 8 1.49 1.13, 1.97 8 1.11 0.82, 1.52 8 1.40 1.04, 1.89 8 1.36 0.92, 2.03
  1. *N=number of studies included in the meta-analysis
  2. Controlled for socioeconomic and maternal nutritional variables from Supplemental Table 1 in Additional file 1.
  3. Reference exposure: parity 1-2 / Age 18-<35.
  4. SGA = small-for-gestational-age, defined as below the 10th percentile of the U.S. 1991 reference distribution described by Alexander and colleagues [38]. AGA = appropriate-for-gestational-age. Preterm = below 37 completed weeks of gestation.