Table 1

Characteristics of study population by mother's region of origin (in %), 2004-2007, (N = 2,623,064)

Germany

Middle and Northern Europe,

Mediterranean

Eastern Europe

Middle East,

Asia

p value*

North America

North Africa


Number of births

2,166,005

37,854

85,874

138,217

164,341

30,773

Single status

No

76.7

83.6

86.1

85.4

90.1

83.9

< 0.0001

Yes

14.9

9.0

6.8

8.4

4.0

8.5

Missing

8.4

7.4

7.0

6.1

5.9

7.5

Social status

Low

31.8

45.4

59.8

56.1

71.4

62.0

< 0.0001

Middle

37.8

24.1

16.3

21.6

9.6

13.4

High

13.5

12.4

4.4

5.2

2.2

4.4

Missing

16.9

18.1

19.6

17.1

16.8

20.3

Maternal age (years)

< 18

0.7

0.3

0.6

0.5

0.3

0.2

< 0.0001

18-29

43.4

42.3

55.8

60.6

59.2

45.0

30-34

31.2

32.3

28.2

26.2

25.8

30.8

35-39

20.3

20.3

12.7

10.4

11.8

19.4

≥ 40

4.4

4.8

2.6

2.4

2.8

4.7

Maternal smoking (during pregnancy)

No

72.9

72.7

67.7

71.0

73.3

79.3

< 0.0001

Yes

10.9

6.2

11.2

7.3

9.2

1.8

Missing

16.2

21.1

21.2

21.7

17.4

18.9

Parity

0

42.5

35.9

32.9

35.7

29.3

36.0

< 0.0001

1

32.1

33.4

32.0

32.1

29.4

33.7

≥ 2

25.4

30.7

35.0

32.2

41.3

30.3

Multiple births

Singletons

96.6

96.7

96.9

97.3

97.0

97.8

< 0.0001

Twins or more

3.4

3.3

3.1

2.7

3.0

2.2

Gestational age (weeks) & birth weight (g)

< 37 & < 2500

4.5

4.1

4.1

3.8

4.3

4.2

< 0.0001

≥ 37 & < 2500

2.7

2.3

2.6

2.0

2.6

2.9

< 37 & ≥ 2500

1.7

1.6

1.5

1.6

1.6

1.5

≥ 37 & ≥ 2500

91.1

92.0

91.7

92.6

91.5

91.4

Number of antenatal visits

0-04

1.4

2.6

2.8

3.1

2.2

3.3

< 0.0001

5-07

4.3

6.9

7.9

7.8

7.8

9.0

8-11

43.1

42.3

47.2

47.0

50.0

49.4

≥ 12

43.1

37.9

33.0

34.7

32.9

29.4

Missing

8.1

10.3

9.2

7.4

7.2

8.9

First antenatal visit (gestational week)

< 9.

46.5

40.3

42.2

39.7

44.9

35.8

< 0.0001

9.-12.

37.5

34.7

35.6

36.9

36.0

38.0

13.-16.

5.7

7.7

7.7

8.8

7.6

9.5

≥ 17.

3.1

8.0

5.9

8.2

5.0

9.3

Missing

7.2

9.3

8.6

6.4

6.5

7.4

Congenital anomalies

No

99.0

98.9

98.8

98.9

99.0

99.0

< 0.001

Yes

1.0

1.1

1.2

1.1

1.0

1.0


* p value for a chi-square test

Reeske et al. BMC Pregnancy and Childbirth 2011 11:63   doi:10.1186/1471-2393-11-63

Open Data