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Table 3 Regression coefficients [β (95% CI)] for fetal development associated with categories of SF, ST and their ratio

From: Iron deficiency in late pregnancy and its associations with birth outcomes in Chinese pregnant women: a retrospective cohort study

  Gestational age (weeks)a Birth weight (g)b Birth length (cm)b
SF (μg/L)
 <  8.3 0 0 0
 8.3–11.5 0.09 (0.01, 0.18)* −25.56 (−45.36, −5.77)* −0.33 (− 0.57, − 0.09)**
 11.6–20.2 − 0.08 (− 0.17, 0.02) −59.63 (−80.30, −38.97)** −0.31 (− 0.57, − 0.05)*
 >  20.2 −0.09 (− 0.19, 0.01) −85.41 (− 108.23, − 62.60)** −0.53 (− 0.81, − 0.25)**
P for trend 0.0039 < 0.0001 0.0023
ST (g/L)
 < 3.64 0 0 0
 3.64–4.08 0.15 (0.06, 0.24)** 33.51 (14.29, 52.73)** −0.18 (− 0.42, 0.05)
 4.09–4.58 0.25 (0.16, 0.33)** 56.15 (36.19, 76.11)** −0.37 (− 0.62, − 0.13)**
 >  4.58 0.27 (0.19, 0.36)** 76.29 (56.00, 96.58)** −0.60 (− 0.85, − 0.35)**
P for trend < 0.0001 < 0.0001 < 0.0001
ST/SF ratio log10 transform
 <  5.28 0 0 0
 5.28–5.54 0.05 (− 0.04, 0.14) 27.31 (7.46, 47.16)** 0.13 (− 0.12, 0.37)
 5.55–5.72 0.23 (0.15, 0.32)** 57.83 (36.69, 78.98)** 0.08 (−0.17, 0.33)
 >  5.72 0.18 (0.08, 0.28)** 97.04 (74.28,119.81)** 0.22 (−0.06, 0.49)
P for trend < 0.0001 < 0.0001 0.1773
  1. a Adjusted for maternal age, gravidity, parity, gestational age, BMI, systolic and diastolic BP at delivery, GDM, ICP, PE, PIH, infants sex, hsCRP (mg/L)and hemoglobin(g/L)
  2. b Additionally adjusted for gestational age
  3. *p < 0.05, **p < 0.01
  4. Abbreviations: CI confidence interval,SF serum ferritin, ST serum transferrin, BMI body mass index, BP blood pressure, GDM gestational diabetes mellitus, ICP intrahepatic cholestasis of pregnancy, PE Preeclampsia, PIH pregnancy-induced hypertension, hsCRP high sensitivity C-reactive protein