Table 1 Background and health characteristics of women with unplanned (n = 825) or planned (n = 1885) pregnancy presented in numbers and valid percentages

Maternal age (years)

< 21

45

6

36

2

81

3

< 0.01

21–25

202

25

324

18

526

20

< 0.01

26–35

453

57

1280

70

1733

66

< 0.01

> 35

98

12

188

10

286

11

0.15

Education (years)

< 9

85

10

85

5

170

6

< 0.01

9–12

362

45

674

36

1036

39

< 0.01

> 12

363

45

1091

59

1454

55

< 0.01

BMI (kg/m²)

< 18.5

17

2

27

2

44

2

0.25

18.5–24.9

434

55

1041

58

1475

57

0.19

25–29.9

205

26

460

26

665

26

0.81

≥ 30

115

15

233

13

348

14

0.26

Partner at first visit to ACU^†

792

96

1875

99.7

2667

99

< 0.01

Smoking 3 months prior to pregnancy

240

29

306

16

546

20

< 0.01

Smoking at first visit to ACU

69

8

46

2

115

4

< 0.01

High alcohol use 3 months before pregnancy^‡

51

8

51

3

102

5

< 0.01

Any alcohol use during pregnancy

508

62

937

50

1445

54

< 0.01

Nulliparous

386

47

833

44

1219

45

0.22

Number of visits to ACU

0–7

204

25

442

23

646

24

0.49

≥8

621

75

1443

77

2064

76

0.49

Late detection of pregnancy^§

25

3

10

0.5

35

1.3

< 0.01

History of psychiatric illness

103

12

157

8

260

10

< 0.01

History of somatic illness

300

36

664

35

964

36

0.57

Foreign maternal origin

116

14

186

10

302

11

< 0.01

Use of folic acid 1 month before pregnancy

71

9

812

43

883

33

< 0.01