Table 1 Baseline characteristics at early pregnancy stratified by tertiles of Hb changes from early to late pregnancy (n = 1986) a, b
From: Changes in maternal hemoglobin during pregnancy and birth outcomes
Characteristics | Total (n = 1986) | Greatest reduction (Hb change < −1.9) (n = 639) | Intermediate reduction (−1.9 ≤ Hb change < −1.0) (n = 689) | Least reduction (Hb change ≥ −1.0) (n = 658) |
|---|---|---|---|---|
Maternal age, (years) | 35.5 (4.2) | 35.6 (4.1) | 35.4 (4.2) | 35.4 (4.4) |
Pre-pregnancy BMI, (kg/m2) | 20.3 (2.6) | 20.5 (2.7) | 20.3 (2.5) | 20.0 (2.6) |
Maternal weight gain until delivery, (kg) | 9.6 (3.4) | 9.5 (3.4) | 9.7 (3.5) | 9.6 (3.2) |
Parity | ||||
0, n (%) | 1057 (53.2) | 296 (46.3) | 373 (54.1) | 388 (59.0) |
1, n (%) | 730 (36.8) | 273 (42.7) | 251 (36.4) | 206 (31.3) |
≥2, n (%) | 199 (10.0) | 70 (11.0) | 65 (9.4) | 64 (9.7) |
ART, n (%) | 310 (15.6) | 101 (15.8) | 108 (15.7) | 101 (15.3) |
Maternal pre-pregnancy complications | ||||
Hypertension, n (%) | 25 (1.3) | 11 (1.7) | 9 (1.3) | 5 (0.76) |
Autoimmune disease, n (%) | 44 (2.2) | 14 (2.2) | 15 (2.2) | 15 (2.3) |
Basedow’s disease, n (%) | 28 (1.4) | 10 (1.6) | 13 (1.9) | 5 (0.76) |
Hypothyroid, n (%) | 51 (2.6) | 13 (2.0) | 22 (3.2) | 16 (2.4) |
Smoking | ||||
Never or former, n (%) | 1981 (99.7) | 638 (99.8) | 688 (99.9) | 655 (99.5) |
Current, n (%) | 5 (0.25) | 1 (0.16) | 1 (0.15) | 3 (0.46) |
Alcohol intake | ||||
Current, n (%) | 158 (8.0) | 48 (7.5) | 58 (8.4) | 52 (7.9) |
MAP at early pregnancy, (mmHg)c | 79.5 (9.6) | 80.8 (9.7) | 79.5 (9.6) | 78.2 (9.4) |