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Table 1 Baseline characteristics of the study population by trimesters of pregnancy

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

Characteristic 1sttrimester (N = 3472) 2ndtrimester (N = 2986) 3rdtrimester (N = 2261)
Maternal age, year 26.0 (0.8) 26.3 (0.5) 25.2 (0.6)
The Han, n (%) 2226 (64.1) 1965 (65.8) 1526 (67.5)
Education (≥12 years), n (%) 1476 (42.5) 1170 (39.2) 1011 (44.7)
Family income (<$ 3000), n (%) 736 (21.2) 582 (19.5) 355 (15.7)
Urban residence, n (%) 1628 (46.9) 1582 (53.0) 1302 (57.6)
Parity (nulliparous), n (%) 2170 (62.5) 1765 (59.1) 1490 (65.9)
Folic acid supplement, n (%) 1430 (41.2) 1135 (38.0) 988 (43.7)
Serum total cholesterol, mg/dL 181.6 (1.1) 221.5 (0.7) 243.6 (0.8)
Serum triglyceride, mg/dL 124.9 (0.9) 177.1 (1.1) 256.8 (1.3)
Diabetes mellitus, n (%) 69 (2.0) 66 (2.2) 133 (5.9)
Body mass index, kg/m2 22.9 (0.2) 24.1 (0.2) 26.5 (0.3)
Hemoglobin, g/dL 12.5 (0.2) 11.7 (0.1) 11.8 (0.1)
Systolic blood pressure, mmHg 110.5 (1.3) 107.0 (1.1) 112.8 (1.0)
Diastolic blood pressure, mmHg 68.4 (0.6) 66.4 (0.5) 73.8 (0.7)
  1. Values are means (standard error) or number (percentage) unless otherwise noted.