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Table 5 Difference (95% CI) in blood pressure by categories of BMI and Hb levels in third trimester

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

  Non-high BMI (<30.9 kg/m2) High BMI (≥30.9 kg/m2)
  Hb <13.0 g/dL Hb ≥13.0 g/dL Hb <13.0 g/dL Hb ≥13.0 g/dL
Number 1435 600 148 78
SBP (mmHg)a 111.3 112.5 113.6 116.9
Model 1b 0.0 (reference) 1.3 (-1.0, 3.7) 2.2 (0.3, 4.1) 5.8 (3.2, 8.4)
Model 2c 0.0 (reference) 1.2 (-1.0, 3.4) 2.2 (0.2, 4.1) 5.6 (3.1, 8.1)
Model 3d 0.0 (reference) 0.8 (-1.1, 2.7) 2.0 (0.3, 3.7) 4.8 (2.3, 7.4)
DBP (mmHg)a 72.5 74.0 74.8 78.5
Model 1b 0.0 (reference) 1.9 (-0.6, 4.3) 2.5 (0.4, 4.7) 6.5 (3.8, 9.1)
Model 2c 0.0 (reference) 1.7 (-0.5, 3.9) 2.4 (0.3, 4.5) 6.2 (3.6, 8.8)
Model 3d 0.0 (reference) 1.2 (-1.0, 3.4) 2.2 (0.2, 4.2) 5.7 (3.2, 8.3)
  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).