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Table 1 Baseline characteristics of mothers according to gestational age at birth. (N = 69,617 births)

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
  1. aVery preterm birth: gestational age less than 32 weeks
  2. bModerate preterm birth: gestational age between 32 + 0 and 36 + 6
  3. cTerm birth: gestational age between 37 + 0 and 41 + 6
  4. dPostterm birth: gestational age 42 weeks or more