Skip to main content

Table 1 Characteristics of the study population (N = 7526) at baseline (14 wks pregnancy)

From: Etiology and prognosis of pregnancy-related pelvic girdle pain; design of a longitudinal study

Aspect

   

%

Age (yrs)

Mean

 

31.54

 

N = 7523

< = 20

  

0.4

 

21–25

  

5.3

 

26–30

  

32.4

 

31–35

  

47.8

 

36–40

  

12.8

 

>40

  

1.2

Country of origin

Netherlands

  

96.5

N = 7516

Belgium, Germany, France, Austria, Switzerland, Luxemburg, Ireland and United Kingdom

  

1.9

 

Other countries

  

1.6

Education

Primary school

  

0.6

N = 7498

Preparatory vocational education

  

7.2

 

Lower general secondary education

  

6.6

 

Vocational education

  

31.9

 

Higher general secondary education

  

8.5

 

Pre-university education

  

2.3

 

Higher vocational education

  

27.7

 

Academic education

  

10.3

 

Different

  

4.9

BMI before pregnancy

< 18.5

Underweight

 

3,1

N = 7437

18.5–24.9

Normal weight

 

68,1

 

25.0–29.9

Overweight

 

20,5

 

> = 30

Extreme overweight

 

8,3

Smoking habits at 14 wks pregnancy

Never

  

59.7

N = 7488

Ex

  

29.8

 

Current during pregnancy

  

10.5

Alcohol-usage (glasses/week) before pregnancy

0

  

44.8

N = 7482

1–10

  

53.5

 

11–20

  

1.6

 

>20

  

0.2

Alcohol-usage (glasses/week) during pregnancy

0

  

91.2

N = 7210

1–10

  

8.8

 

11–20

  

0.0

 

>20

  

0.0

Work (hours/week)

No job

  

13.9

N = 7428

1–10

  

3.8

 

11–20

  

22.9

 

21–30

  

21.1

 

31–40

  

36.9

 

>40

  

1.5

Number of pregnancies

1

  

42.3

N = 7519

2

  

36.6

 

3

  

14.2

 

4

  

4.6

 

>4

  

2.3