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Table 4 ORs (95% CIs) for adverse pregnancy outcomes according to the quartiles of D-value for hemoglobin (Hb) levels

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

 

D-value for Hb levels (g/L)

P trend

Q1 (<−4.49)

Q2 (−4.48–1.67)

Q3 (1.68–7.17)

Q4 (> 7.18)

PTB

 Case/N

35/478

31/484

29/475

13/474

 

 Model 1

1

0.87 (0.53, 1.43)

0.82 (0.49, 1.37)

0.36 (0.19, 0.68)

0.003

 Model 2

1

0.87 (0.53, 1.44)

0.80 (0.48, 1.35)

0.35 (0.18, 0.68)

0.003

LBW

 Case/N

23/478

13/484

18/475

12/474

 

 Model 1

1

0.55 (0.27, 1.09)

0.78 (0.42, 1.46)

0.52 (0.25, 1.05)

0.127

 Model 2

1

0.54 (0.27, 1.09)

0.79 (0.42, 1.49)

0.47 (0.23, 0.98)

0.089

SGA

 Case/N

17/478

20/484

25/475

24/474

 

 Model 1

1

1.17 (0.61, 2.26)

1.51 (0.80, 2.83)

1.45 (0.77, 2.73)

0.184

 Model 2

1

1.16 (0.60, 2.26)

1.45 (0.77, 2.74)

1.27 (0.66, 2.43)

0.371

  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