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Table 1 Characteristics of the participants and prevalence of overweight and obesity in the successive surveys.

From: Changes of overweight and obesity in the adult Swiss population according to educational level, from 1992 to 2007

  1992/3 1997 2002 2007 Test
Sample size 14,521 12,474 18,908 17,879 3.16 NS
Women (%) 7946 (54.7) 6937 (55.6) 10,345 (54.7) 9862 (55.2)  
Age (years)      
   Men 44.3 ± 16.7 45.2 ± 17.0 48.6 ± 16.9 49.6 ± 17.2 160.2 ***
   Women 46.1 ± 17.5 47.8 ± 18.1 50.4 ± 17.3 51.3 ± 17.9 160.5 ***
Educational level (%)      
   Low 3081 (21.2) 2747 (22.0) 3635 (19.2) 2471 (13.8)  
   Middle 8300 (57.2) 7577 (60.7) 12,082 (63.9) 10,523 (58.9) 1005 ***
   High 3140 (21.6) 2150 (17.2) 3191 (16.9) 4885 (27.3)  
Men      
   Mean BMI (kg/m2) 24.7 ± 3.6 24.9 ± 3.4 25.3 ± 3.7 25.4 ± 3.6 65.06 ***
   Overweight (%) 5841 (34.1) 1980 (35.8) 3351 (39.1) 3217 (40.1) 184.9 ***
   Obesity (%) 411 (6.3) 374 (6.8) 765 (8.9) 752 (9.4)  
Women      
   Mean BMI (kg/m2) 22.8 ± 3.8 23.4 ± 4.3 23.7 ± 4.2 23.7 ± 4.3 90.95 ***
   Overweight (%) 1386 (17.4) 1470 (21.2) 2398 (23.2) 2248 (22.8) 231.6 ***
   Obesity (%) 392 (4.9) 500 (7.2) 825 (8.0) 836 (8.5)  
All subjects      
   Mean BMI (kg/m2) 23.6 ± 3.8 24.0 ± 4.0 24.4 ± 4.1 24.5 ± 4.1  
   Overweight (%) 3627 (25.0) 3450 (27.7) 5749 (30.4) 5465 (30.6) 386.4 ***
   Obesity (%) 803 (5.5) 874 (7.0) 1590 (8.4) 1588 (8.9)  
  1. BMI: body mass index; overweight is defined as a BMI ≥ 25 and <30 kg/m2. Obesity is defined as a BMI ≥ 30 kg/m2. Results are expressed as number of subjects and (percentage) or as mean ± standard deviation. Statistical analysis by chi-square or analysis of variance: NS, not significant; ***, p < 0.001. For BMI, further adjustment on age led to similar findings: F test = 28.8 (p < 0.001) for men and F test = 44.1 (p < 0.001) for women.