Table 1 Baseline characteristics of the study population by trimesters of pregnancy â€
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) |