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Table 1 Sample descriptive statistics at baselinea

From: Obesity trends and risk factors in the South African adult population

Variable N Median/percentage IQR/frequency Range
Men 10100 37.81 % 3819  
Age [years] 10099 38 [26 ; 52] [18 ; 101]
Race 10100    
Black   81.07 % 8188  
Coloured   14.31 % 1445  
White   3.38 % 341  
Asian   1.25 % 126  
Education 10091    
None   15.61 % 1575  
Primary (1 – 7 years)   25.07 % 2530  
Secondary (8 – 12 years)   51.17 % 5164  
Tertiary (>12 years)   8.15 % 822  
Urban 10100 54.02 % 5456  
Quintile of household income per capita 10100    
I (0-217 ZARb)   15.39 % 1554  
II (218 - 345 ZAR)   16.82 % 1669  
III (346 - 531 ZAR)   18.82 % 1901  
IV (532 - 992 ZAR)   22.84 % 2307  
V (993 - 62343 ZAR)   26.13 % 2639  
Urban 10100 54.02 % 5456  
Current smoking 9138 20.09 % 1845  
Current use of alcohol 9191 22.48 % 2066  
Exercise frequency 9159    
Low (<once a week)   79.40 % 7272  
Moderate (1/2 times a week)   9.95 % 911  
High (>2 times a week)   10.66 % 976  
Waist circumference [cm] 8376 85.55 [76.03 ; 98.05] [30.40 ; 197.30]
BMI [kg/m2] 8177 25.18 [21.48 ; 30.85] [10.61 ; 59.22]
BMI category 8177    
Underweight   5.38 % 440  
Normal weight   43.44 % 3552  
Overweight   23.08 % 1887  
Obese   28.10 % 2298  
  1. aN = number of non-missing values; IQR = interquartile range
  2. Values are unweighted
  3. bZAR = South African Rand. 1 ZAR = 0.12 US Dollars (average exchange rate in 2008)