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Table 2 Sample distribution and population estimates of BMI in the three waves

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

Variable Wave 1   Wave 2   Wave 3
  Sample   Pop   Sample   Pop   Sample   Pop
   Mean/Perc   Mean/Perc    Mean/Perc   Mean/Perc    Mean/Perc   Mean/Perc
  N      N      N    
BMI [kg/m2] 8177 27.11   26.75   8184 27.70   27.36   8728 27.79   27.53
   (0.09)   (0.17)    (0.09)   (0.17)    (0.09)   (0.15)
BMI category               
Underweight 440 5.38 %   4.75 %   366 4.47 %   4.27 %   226 2.59 %   2.29 %
     (0.44 %)      (0.40 %)      (0.31 %)
Normal weight 3552 43.44 %   43.04 %   3073 37.55 %   39.11 %   3319 38.03 %   38.87 %
     (1.38 %)      (1.29 %)      (1.21 %)
Overweight 1887 23.08 %   24.84 %   2066 25.24 %   25.84 %   2403 27.53 %   27.86 %
     (1.01 %)      (0.89 %)      (1.00 %)
Obese 2298 28.10 %   27.37 %   2679 32.73 %   30.77 %   2780 31.85 %   30.98 %
     (0.91 %)      (1.06 %)      (0.95 %)
  1. N= number of non-missing values
  2. Values in brackets are standard deviations (sample) and standard errors (population)