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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