Skip to main content

Table 1 Mean number of childbirths and mean age at childbirths, in broad subgroups defined by covariates

From: Associations between the number of children, age at childbirths and prevalence of chronic low back pain: the Nord-Trøndelag Health Study

 

Mean number of childbirths

Mean age at childbirth among women with 1 child only

Mean age at first childbirth among women with ≥2 children

Mean age at last childbirth among women with ≥2 children

Total data seta

2.3

24.9

22.6

29.6

Age when information was collected (years)

 20–29

0.8

22.7

21.0

24.8

 30–39

2.2

25.9

22.8

28.9

 40–49

2.4

25.6

22.4

29.1

 50–59

2.7

26.1

22.5

29.5

 60–69

3.0

26.4

23.3

32.5

BMI (kg/m2)

  < 25

2.0

24.6

22.7

29.1

 25–29.9

2.4

25.3

22.6

29.7

  ≥ 30

2.6

25.4

22.5

30.2

Physical activity per week

  < 1 h hard

2.3

25.1

22.6

29.5

 1–2 h hard

1.9

24.5

22.9

29.0

  ≥ 3 h hard

1.6

24.4

22.6

28.7

Cigarette smoking

 never

2.1

25.8

23.3

30.2

 daily former

2.4

25.5

22.8

29.8

 daily current

2.2

23.7

21.6

28.5

Education (years)

  ≤ 9

2.8

24.8

21.8

29.9

 10–12

2.0

24.2

22.3

28.6

  ≥ 13

1.8

26.6

24.8

30.6

HADS score

 0–4

2.1

25.0

22.8

29.3

 5–9

2.2

24.8

22.7

29.4

 10–14

2.3

25.0

22.5

29.5

 15–19

2.4

24.3

22.2

29.3

 20–39

2.5

24.2

21.9

29.5

  1. aAmong women who were not pregnant when information was collected