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Table 2 ORs (95% CIs) for adverse pregnancy outcomes according to the hemoglobin (Hb) levels at the second 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 23/405 44/779 31/583 10/144
 Model 1 1.01 (0.60, 1.69) 1 0.94 (0.59, 1.51) 1.25 (0.61, 2.54)
 Model 2 1.05 (0.62, 1.77) 1 0.95 (0.59, 1.54) 1.25 (0.61, 2.58)
LBW
 Case/N 15/405 21/779 21/583 9/144
 Model 1 1.39 (0.71, 2.72) 1 1.35 (0.73, 2.49) 2.41 (1.08, 5.37)
 Model 2 1.29 (0.65, 2.57) 1 1.39 (0.75, 2.59) 2.54 (1.12, 5.76)
SGA
 Case/N 24/405 31/779 24/583 7/144
 Model 1 1.52 (0.88, 2.63) 1 1.04 (0.60, 1.79) 1.23 (0.53, 2.86)
 Model 2 1.37 (0.78, 2.39) 1 1.08 (0.63, 3.40) 1.45 (0.62, 3.40)
  1. Model 1: without adjustment
  2. Model 2: adjustment for age, BMI, education, conception method, parity and history of miscarriage and GDM
  3. Abbreviations: PTB preterm birth, LBW low-birth-weight infants, SGA small-for-gestational-age infants