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Table 1 Selected characteristics of the sample, and the association with BMIb)

From: Depression and body mass index, a u-shaped association

Variable Value Total (N) % Under-weight (%) Normal weight (%) Over-weight (%) Obese (%) P
Gender Male 21181 48.65 1.11 47.70 41,7 9.49 0.000
  Female 22083 50.72 2.55 56.86 28.97 11.61  
Age 20–29 6027 14.27 4.05 70.42 20.97 4.56 0.000
  30–39 8649 20.47 1.72 56.89 32.18 9.21  
  40–49 8526 20.18 1.15 53.00 35.16 10.68  
  50–59 7908 18.72 0.81 43.56 41.79 13.66  
  60–69 5590 13.23 0.91 39.84 44.35 10.82  
  70+ 5274 12.48 2.01 43.08 42.78 12.53  
Education Preschool only 6938 15.93 1.90 40.83 40.28 16.98  
  High school lower level 6851 15.74 1.72 46.08 38.50 13.69 0.000
  High school medium level 3347 7.69 2.38 55.46 32.38 9.78  
  High school high level 15799 36.29 2.00 54.59 34.29 9.12  
  University/college 9668 22.21 1.46 60.36 31.71 6.46  
Ethnicity Dutch 37481 86.66 1.79 52.29 35.47 10.45 0.000
  Foreign/western 3392 7.84 2.09 54.57 33.37 9.96  
  Foreign/non-western 2390 5.52 2.47 50.59 33.64 13.31  
Year of survey 2001 6861 15.86 1.81 53.29 35.48 9.63 0.009
  2002 6942 16.05 2.03 53.13 35.00 9.84  
  2003 6896 15.94 1.97 51.60 35.77 10.66  
  2004 7897 18.25 1.77 51.64 35.49 11.09  
  2005 7559 17.47 1.79 53.18 34.13 10.09  
  2006 7109 16.43 1.74 51.48 35.39 11.38  
  1. a) All associations were examined with χ2 analyses
  2. b) BMI Categories: Underweight (14–18.5 kg/m2), Normal weight (18.5–25 kg/m2), Overweight (25–30 kg/m2), Obesity (30–60 kg/m2).