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Table 2 Relative risk for adverse birth outcomes by parity, among overall women and subgroups

From: Parity and the risks of adverse birth outcomes: a retrospective study among Chinese

  Crude RR (95% CI) Adjusted RR (95% CI)
PTB
 Overall 1.14 (1.12, 1.17) 0.91 (0.89, 0.93)
 MPTB 1.13 (1.11, 1.15) 0.90 (0.88, 0.93)
 VPTB 1.39 (1.27, 1.53) 1.08 (0.96, 1.22)
LBW
 Overall 0.89 (0.86, 0.91) 0.74 (0.72, 0.77)
 Preterm birth 0.89 (0.86, 0.91) 0.89 (0.86, 0.91)
 Term birth 0.72 (0.69, 0.75) 0.65 (0.62, 0.69)
SGA
 Overall 0.66 (0.65, 0.68) 0.67 (0.66, 0.69)
 Preterm birth 0.72 (0.68, 0.78) 0.68 (0.62, 0.74)
 Term birth 0.66 (0.64, 0.67) 0.68 (0.66, 0.69)
  1. MPTB was defined as gestational age between 32 and 36 weeks; VPTB was defined as gestational age between < 32 weeks; PTB was defined as gestational age < 37 weeks, LBW was defined as birth weight < 2500 g; SGA was defined as birth weight below 10th centile for specific gestational age and sex
  2. Reference group: Nulliparity
  3. Adjusted for maternal age and race, residence, immigrant, education, pre-pregnancy obesity, paternal age and race, sex of newborn
  4. Abbreviations: PTB Preterm Birth, LBW Low Birth Weight, SGA Small for Gestational Age, MPTB Moderate Preterm Birth, VPTB Very Preterm Birth