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Table 3 Regression coefficient (95% CI) of additive model for blood pressure by categories of BMI and Hb levels in pregnancy

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

Variable SBP DBP
β(95% CI) Pvalue β(95% CI) Pvalue
First trimester     
 Constant 70.3 (64.0, 76.6) <0.001 55.6 (47.9, 63.3) <0.001
bmi 2.6 (0.3, 4.9) 0.01 2.5 (0.1, 4.9) 0.03
hb 1.4 (-0.3, 3.1) 0.09 1.0 (-1.0, 3.0) 0.16
bmi × hb -1.1 (-3.7, 1.6) 0.14 0.4 (-2.3, 3.1) 0.38
Second trimester     
 Constant 72.1 (65.8, 78.4) <0.001 56.9 (49.1, 64.7) <0.001
bmi 1.9 (-0.5, 4.3) 0.22 0.8 (-1.5, 3.2) 0.32
hb 0.6 (-1.6, 2.8) 0.54 -0.2 (-2.3, 1.9) 0.63
bmi × hb 0.1 (-2.6, 2.8) 0.30 0.9 (-1.7, 3.5) 0.11
Third trimester     
 Constant 74.1 (67.8, 80.4) <0.001 59.3 (51.6, 67.0) <0.001
bmi 2.0 (0.3, 3.7) 0.009 2.2 (0.2, 4.2) 0.01
hb 0.8 (-1.1, 2.7) 0.27 1.2 (-1.0, 3.4) 0.12
bmi × hb 2.0 (0.1, 3.9) 0.02 2.3 (0.4, 4.3) 0.004
  1. Adjusted for age (continuous), ethnicity (Han, Zhuang, other), education (<12 years, ≥12 years), family income < US$ 3000 (yes, no), urban residence (yes, no), parity (0, 1, >1), folic acid supplement (yes, no), total cholesterol (continuous), triglycerides (continuous), and diabetes mellitus (yes, no).