From: Accelerated fetal growth in early pregnancy and risk of preterm birth: a prospective cohort study
Characteristics | Very preterm birthsa (n = 378) | Moderate preterm birthsb (n = 2460) | Term birthsc (n = 62,971) | Postterm birthsd (n = 3808) | P- value |
---|---|---|---|---|---|
Maternal age older than 35 y | 197 (52.1) | 1121 (45.6) | 28,470 (45.2) | 1789 (46.9) | 0.009 |
Short maternal height (< 155 cm) | 17 (4.5) | 98 (3.9) | 1508 (2.4) | 57 (1.5) | < 0.0001 |
Obesity (BMI ≥ 30 kg/m2) | 40 (10.9) | 219 (9.4) | 4055 (6.7) | 271 (7.5) | < 0.0001 |
Non- Nordic origin | 88 (25.8) | 413 (19.6) | 10,312 (18.4) | 525 (15.9) | < 0.0001 |
Primiparity | 182 (48.1) | 1187 (48.2) | 36,197 (57.5) | 1629 (42.8) | < 0.0001 |
Smoking | 15 (4.1) | 82 (3.4) | 1575 (2.5) | 82 (2.2) | 0.007 |
In vitro fertilization (IVF) | 45 (11.9) | 228 (9.3) | 3993 (6.3) | 168 (4.4) | < 0.0001 |
Chronic hypertension | 11 (2.9) | 51 (2.1) | 556 (0.9) | 27 (0.7) | < 0.0001 |
Pre-gestational diabetes mellitus | 1 (0.2) | 28 (1.1) | 116 (0.2) | 0 | < 0.0001 |
Male fetal gender | 208 (55.0) | 1334 (54.2) | 31,959 (50.7) | 2028 (53.3) | < 0.0001 |