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Table 3 ORs (95% CIs) for adverse pregnancy outcomes according to hemoglobin (Hb) levels at the third trimester

From: High hemoglobin level is a risk factor for maternal and fetal outcomes of pregnancy in Chinese women: A retrospective cohort study

  Hb levels (g/L)
< 110 110–119 120–129 > 130
PTB
 Case/N 29/392 37/698 25/609 17/212
 Model 1 1.43 (0.86, 2.36) 1 0.77 (0.46, 1.29) 1.56 (0.86, 2.83)
 Model 2 1.51 (0.91, 2.51) 1 0.79 (0.47, 1.34) 1.64 (0.89, 3.01)
LBW
 Case/N 16/392 22/698 15/609 6/212
 Model 1 1.31 (0.68, 2.52) 1 0.78 (0.40, 1.51) 2.01 (0.99, 4.07)
 Model 2 1.40 (0.72, 2.72) 1 0.82 (0.42, 1.60) 2.20 (1.07, 4.51)
SGA
 Case/N 18/392 29/698 23/609 16/212
 Model 1 1.11 (0.61, 2.03) 1 0.91 (0.52, 1.58) 1.88 (1.01, 3.54)
 Model 2 1.11 (0.60, 2.03) 1 0.94 (0.53, 1.65) 2.00 (1.05, 3.80)
  1. Model 1: without adjustment
  2. Model 2: adjustment for age, BMI, education, conception method, parity, history of miscarriage and GDM
  3. Abbreviations: PTB preterm birth, LBW low-birth-weight infants, SGA small-for-gestational-age infants