Table 1.
Maternal characteristics of the study population according to risk factors.
| Overall (n = 1921) |
Maternal Age | Body Mass Index | Smoker | |||||
|---|---|---|---|---|---|---|---|---|
| Less Than 40 (n = 1776) |
40 or more (n = 145) |
<18 (n = 29) | 18 to <35 (n = 1802) |
≥35 | No | Yes | ||
| (n = 90) | (n = 1647) | (n = 274) | ||||||
| Maternal age in years, | 33.6 | 33.1 | 41.2 | 29.8 | 33.7 | 32.8 | 33.8 | 32.3 |
| median (IQR) | (30.0, 36.6) | (29.7, 35.9) | (40.5, 42.2) | (24.5, 33.9) | (30.1, 36.6) | (30, 36) | (30.3, 36.6) | (29.0, 36.0) |
| Body mass index in kg/m2, median (IQR) | 24.0 | 23.9 | 24.9 | 17.2 | 23.9 | 38.0 | 24.0 | 24.4 |
| (21.7, 27.5) | (21.6, 27.5) | (22.2, 27.5) | (16.87, 17.5) | (21.7, 27) | (36.4, 40.3) | (21.7, 27.5) | (21.8, 27.6) | |
| Smoker, n (%) | 274 (14.3%) | 259 (14.6%) | 15 (10.3%) | 6 (20.7%) | 254 (14.1%) | 14 (15.6%) | 0 | 274 (100%) |
| Race, n (%) | ||||||||
| White | 1873 (97.5%) | 1735 (97.7%) | 138 (95.2%) | 29 (100%) | 1756 (97.4%) | 88 (97.8%) | 1601 (97.2%) | 272 (99.3%) |
| Black | 30 (1.6%) | 24 (1.4%) | 6 (4.1%) | 0 | 28 (1.6%) | 2 (2.2%) | 28 (1.7%) | 2 (0.7%) |
| East Asian | 9 (0.5%) | 8 (0.5%) | 1 (0.7%) | 0 | 9 (0.5%) | 0 | 9 (0.5%) | 0 |
| Mixed | 5 (0.3%) | 5 (0.3%) | 0 | 0 | 5 (0.3%) | 0 | 5 (0.3%) | 0 |
| South Asian | 4 (0.2%) | 4 (0.2%) | 0 | 0 | 4 (0.2%) | 0 | 4 (0.2%) | 0 |
| Nulliparity n (%) | 847 (44.1%) | 796 (44.8%) | 51 (35.2%) | 14 (48.3%) | 802 (44.5%) | 31 (34.4%) | 713 (43.3%) | 134 (48.9%) |
| Conception n (%) | ||||||||
| Spontaneous | 1798 (93.6%) | 1692 (95.3%) | 106 (73.1%) | 29 (100%) | 1683 (93.4%) | 86 (95.6%) | 1539 (93.4%) | 259 (94.5%) |
| Assisted reproductivetechniques | 123 (6.4%) | 84 (4.7%) | 39 (26.9%) | 0 | 119 (6.6%) | 4 (4.4%) | 108 (6.6%) | 15 (5.5%) |
| Chronic hypertension n (%) | 28 (1.5%) | 22 (1.2%) | 6 (4.1%) | 0 | 22 (1.2%) | 6 (6.7%) | 25 (1.5%) | 3 (1.1%) |
| Diabetes Mellitus n (%) | ||||||||
| Type 1 | 10 (0.5%) | 9 (0.5%) | 1 (0.7%) | 0 | 9 (0.5%) | 1 (1.1%) | 10 (0.6%) | 0 |
| Type 2 | 5 (0.3%) | 4 (0.2%) | 1 (0.7%) | 0 | 5 (0.3%) | 0 | 4 (0.2%) | 1 (0.4%) |
| APS and/or SLE n (%) | 22 (1.1%) | 20 (1.1%) | 1 (1.4%) | 0 | 22 (1.2%) | 0 | 22 (1.3%) | 0 |
| Previous preeclampsia n (%) | 55 (2.9%) | 52 (2.9%) | 3 (2.1%) | 1 (3.2%) | 49 (2.7%) | 5 (5.6%) | 49 (3.0%) | 6 (2.2%) |
| Previous neonate’s birth weight <10th percentile n (%) | 259 (13.5%) | 234 (13.2%) | 25 (17.2%) | 5 (16.1%) | 245(13.6%) | 9(10%) | 213 (12.9%) | 46 (16.8%) |
| Previous neonate’s birth weight <3rd percentile n (%) | 127 (6.6%) | 112 (6.3%) | 15 (10.3%) | 4 (12.9%) | 120 (6.7%) | 3(3.3%) | 102 (6.2%) | 25 (9.1%) |
| Previous Gestational Diabetes n (%) | 67 (3.5%) | 57 (3.2%) | 10 (6.9%) | 0 | 57 (3.2%) | 10 (11.1%) | 56 (3.4%) | 11 (4.0%) |
| Previous preterm birth n (%) | 83 (4.3%) | 74 (4.2%) | 9 (6.2%) | 1 (3.4%) | 80 (4.4%) | 2 (2.2%) | 69 (4.2%) | 14 (5.1%) |
| Previous fetal weight > 95% percentile n (%) | 34 (3.2%) | 32 (3.3%) | 2 (2.1%) | 0 (0%) | 29 (2.9%) | 5 (8.5%) | 29 (3.1%) | 5 (3.6%) |
Results are expressed as the median (interquartile rage, IQR) and n and percentage (%) as required; APS: antiphospholipid syndrome; SLE: systemic lupus-erithematosus.