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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     %
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