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Table 1 Mean sex-and-age-specific cut-points for percentage body fat equivalent to body mass index 18.5 kg/m 2 (underweight), 25.0 kg/m 2 (overweight) and BMI 30.0 kg/m 2 (obese)

From: Body mass index and measures of body fat for defining obesity and underweight: a cross-sectional, population-based study

Age (yr) Underweight Overweight Obese
  Men Women Men Women Men Women
20-29 9.3 21.8 20.6 36.0 27.5 43.4
30-39 9.9 22.0 21.2 36.2 28.1 43.6
40-49 10.5 22.2 21.8 36.4 28.7 43.8
50-59 11.1 22.4 22.4 36.6 29.3 44.0
60-69 11.7 22.6 23.0 36.8 29.9 44.2
70-79 12.3 22.8 23.6 37.0 30.5 44.4
80+ 12.9 23.0 24.2 37.2 31.1 44.6
  1. BMI body mass index (kg/m2); %BF percentage body fat mass.