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Table 4 Difference (95% CI) in blood pressure by categories of BMI and Hb levels in second trimester

From: Interaction of body mass index and hemoglobin concentration on blood pressure among pregnant women in Guangxi, China

  Non-high BMI (<28.5 kg/m2) High BMI (≥28.5 kg/m2)
  Hb <13.0 g/dL Hb ≥13.0 g/dL Hb <13.0 g/dL Hb ≥13.0 g/dL
Number 2201 488 190 109
SBP (mmHg)a 106.3 107.7 108.6 108.9
Model 1b 0.0 (reference) 1.1 (-1.3, 3.4) 2.2 (-0.6, 5.0) 3.2 (1.0, 5.5)
Model 2c 0.0 (reference) 0.9 (-1.5, 3.3) 2.1 (-0.4, 4.6) 3.0 (0.9, 5.1)
Model 3d 0.0 (reference) 0.6 (-1.6, 2.8) 1.9 (-0.5, 4.3) 2.6 (0.4, 4.8)
DBP (mmHg)a 66.2 66.4 67.2 68.1
Model 1b 0.0 (reference) 0.5 (-1.9, 2.8) 1.4 (-1.0, 3.8) 2.2 (-0.8, 5.2)
Model 2c 0.0 (reference) 0.2 (-2.0, 2.5) 1.2 (-1.1, 3.7) 2.2 (-0.7, 5.1)
Model 3d 0.0 (reference) -0.2 (-2.3, 1.9) 0.8 (-1.5, 3.2) 1.5 (-1.3, 4.3)
  1. CI, confidence interval; SBP, systolic blood pressure; DBP, diastolic blood pressure; Hb, Hemoglobin.
  2. aMean SBP; mean DBP.
  3. bModel 1: Adjusted for age (continuous) and ethnicity (Han, Zhuang, other).
  4. cModel 2: Further adjusted for education (<12 years, ≥12 years), family income < US$ 3000 (yes, no), urban residence (yes, no), parity (0, 1, >1), and folic acid supplement (yes, no).
  5. dModel 3: Further adjusted for total cholesterol (continuous), triglycerides (continuous), and diabetes mellitus (yes, no).