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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

Ā Ā Ā 

%

Age (yrs)

Mean

Ā 

31.54

Ā 

N = 7523

< = 20

Ā Ā 

0.4

Ā 

21ā€“25

Ā Ā 

5.3

Ā 

26ā€“30

Ā Ā 

32.4

Ā 

31ā€“35

Ā Ā 

47.8

Ā 

36ā€“40

Ā Ā 

12.8

Ā 

>40

Ā Ā 

1.2

Country of origin

Netherlands

Ā Ā 

96.5

N = 7516

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

Ā Ā 

1.9

Ā 

Other countries

Ā Ā 

1.6

Education

Primary school

Ā Ā 

0.6

N = 7498

Preparatory vocational education

Ā Ā 

7.2

Ā 

Lower general secondary education

Ā Ā 

6.6

Ā 

Vocational education

Ā Ā 

31.9

Ā 

Higher general secondary education

Ā Ā 

8.5

Ā 

Pre-university education

Ā Ā 

2.3

Ā 

Higher vocational education

Ā Ā 

27.7

Ā 

Academic education

Ā Ā 

10.3

Ā 

Different

Ā Ā 

4.9

BMI before pregnancy

< 18.5

Underweight

Ā 

3,1

N = 7437

18.5ā€“24.9

Normal weight

Ā 

68,1

Ā 

25.0ā€“29.9

Overweight

Ā 

20,5

Ā 

> = 30

Extreme overweight

Ā 

8,3

Smoking habits at 14 wks pregnancy

Never

Ā Ā 

59.7

N = 7488

Ex

Ā Ā 

29.8

Ā 

Current during pregnancy

Ā Ā 

10.5

Alcohol-usage (glasses/week) before pregnancy

0

Ā Ā 

44.8

N = 7482

1ā€“10

Ā Ā 

53.5

Ā 

11ā€“20

Ā Ā 

1.6

Ā 

>20

Ā Ā 

0.2

Alcohol-usage (glasses/week) during pregnancy

0

Ā Ā 

91.2

N = 7210

1ā€“10

Ā Ā 

8.8

Ā 

11ā€“20

Ā Ā 

0.0

Ā 

>20

Ā Ā 

0.0

Work (hours/week)

No job

Ā Ā 

13.9

N = 7428

1ā€“10

Ā Ā 

3.8

Ā 

11ā€“20

Ā Ā 

22.9

Ā 

21ā€“30

Ā Ā 

21.1

Ā 

31ā€“40

Ā Ā 

36.9

Ā 

>40

Ā Ā 

1.5

Number of pregnancies

1

Ā Ā 

42.3

N = 7519

2

Ā Ā 

36.6

Ā 

3

Ā Ā 

14.2

Ā 

4

Ā Ā 

4.6

Ā 

>4

Ā Ā 

2.3