Table 1 Descriptive statistics of women who gave birth between 2017 and 2022; N = 16,092 (Cohort 1)

Live births

(n)

2835

2986

2999

2824

2856

2624

Age in years (mean; st.dev.)

32.0 ± 5.3

32.1 ± 5.3

32.2 ± 5.4

32.3 ± 5.3

32.4 ± 5.3

32.2 ± 5.7

BMI in kg/m² (mean; st.dev.)

25.1 ± 6.2

25.0 ± 5.8

25.1 ± 5.7

25.7 ± 6.9

25.5 ± 5.9

25.8 ± 7.3

Gravidity

(mean; st.dev.)

2.2 ± 1.5

2.2 ± 1.4

2.3 ± 1.5

2.3 ± 1.5

2.3 ± 1.5

2.3 ± 1.7

Parity

(mean; st.dev.)

1.7 ± 1.1

1.7 ± 1.0

1.3 ± 1.2

0.9 ± 1.1

0.9 ± 1.1

0.9 ± 1.2

Duration of pregnancy in weeks

< 34 + 0

(in %)

6.5

6.5

7.3

3.8

4.1

4.3

34 + 0–36 + 6

(in %)

15.4

15.3

16.2

8.7

8.3

8.4

37 + 0–40 + 6

(in %)

77.8

78.1

76.4

78.4

77.7

78.8

> 41 + 0

(in %)

0.2

0.1

0.1

9.1

9.9

8.5

Infant weight

Infant weight in gramm (mean; st.dev.)

3258 ± 676

3254 ± 694

3257 ± 688

3241 ± 707

3252 ± 673

3230 ± 673

< 2000 g

(in %)

5.3

5.4

5.0

6.2

5.1

5.6

2000–2499 g

(in %)

5.8

5.4

5.9

5.8

6.2

6.4

2500–4000 g

(in %)

82.4

82.8

82.0

77.9

79.6

79.1

> 4000 g

(in %)

6.5

6.4

7.1

10.1

9.1

8.8

Birth mode

Spontaneous delivery

(in %)

64.9

64.3

65.6

65.9

64.7

61.4

Vaginal operative delivery

(in %)

3.4

5.4

5.2

6.0

5.5

6.5

Cesarean section

(in %)

31.7

30.3

29.2

28.1

29.8

32.1