Table 1 Population and clinical characteristics of women with a previous live birth compared to women with a stillbirth in the first pregnancy

Age

  < 25 years

16.951

(6.8)

282

(13.7)

1.42

1.26—1.60

1.12

0.98—1.28

 25–29 years

64.067

(25.6)

646

(31.4)

Ref

Ref

 30–34 years

118.209

(47.1)

753

(36.6)

0.99

0.89—1.10

0.96

0.86 – 1.08

  ≥ 35 years

51.542

(20.6)

377

(18.3)

1.73

1.49—2.01

1.29

1.10 – 1.52

Low social economic status (< 25^th percentile)

51.729

(20.6)

536

(26.0)

1.29

1.17—1.42

1.11

0.99 – 1.25

Non-Western ethnicity

27.375

(10.9)

339

(16.5)

1.55

1.38—1.75

1.21

1.05 – 1.40

Mean interpregnancy interval in months (SD)

30.6

(13.0)

18.3

(9.9)

0.83

0.82—0.83

0.85

0.84 – 0.87

GENERAL HISTORY

 Diabetes

1.749

(0.7)

21

(1.0)

1.47

0.95—2.26

1.72

1.08 – 2.76

 Hypertensive disorders

31.275

(12.5)

370

(18.0)

1.54

1.37—1.72

0.89

0.78 – 1.02

 Thromboembolic disorders

527

(0.2)

6

(0.3)

1.39

0.62—3.11

0.98

0.39 – 2.45

OBSTETRIC OUTCOME (first pregnancy)

 Gender first born: male

128.435

(51.2)

1.128

(54.8)

1.16

1.06—1.26

1.02

0.93 – 1.13

 Small for gestational age (< 10^th percentile)

37.004

(14.8)

1.228

(59.7)

8.55

7.82—9.34

4.66

4.19 – 5.18

 Placental abruption

331

(0.1)

124

(6.0)

48.53

39.3—59.9

13.7

10.3 – 18.2