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Table 2 A comparison between the total Dutch female population and the study population

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

  Total Dutch population Study population
  Period 2001 Period 2002 Period 2003 Period 2001
(N = 2892)
Period 2002
(N = 3567)
Period 2003
(N = 1061)
BMI %* %* %* % % %
   - Underweight (<18.5) 5.3 4.9 3.0 2,9 3,2 3,5
   - Normal weight (18.5–24.9) 70.3 71.9 71.2 66,8 68,5 70,4
   - Overweight (25.0–29.9) 18.5 17.8 18.0 21,3 20,3 18,9
   - Extreme overweight (> = 30) 5.9 5.4 7.8 9,1 8,1 7,2
Smoking %* %* %* % % %
   - Current/before pregnancy 35.7 34.0 33.3 29.7 29.3 31.7
Pregnancy-related factors
Mean age mother       
   - Total pregnancies 30.8 30.9 31.0 31.1 31.7 32.4
   - First pregnancies 29.2 29.2 29.3 29.6 30.2 30.9
Child % % % % % %
   - Boy 51.2 51.3 51.4 51.0 52.2 50.5
   - Girl 48.8 48.7 48.6 49.0 47.8 49.5
Number of pregnancies: % % % % % %
   - First 46.3 45.8 45.5 44,6 41,0 41.0
   - Second 36.3 36.7 36.9 35,6 37,2 37.3
   - Third 12.3 12.5 12.6 13,6 14,7 13.9
   - Fourth or more 5.1 5.0 5.0 6,2 7,1 7.8
Multiple pregnancy % % % % % %
   - Twin 1.9 1.9 1.8 1.0 0.9 1.1
  1. * Age-group comparable to study-population