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. 2024 Jan 9;33(1):11–19. doi: 10.7570/jomes23060

Table 5.

International Obesity Task Force (IOTF) BMI cut-off for obesity by sex between the ages of 12 and 18

Age (yr) BMI equivalent to an adult BMI 30 kg/m2 according to IOTF
Boys Girls
12 26.02 26.67
12.5 26.43 27.24
13 26.84 27.76
13.5 27.25 28.20
14 27.63 28.57
14.5 27.98 28.87
15 28.30 29.11
15.5 28.60 29.29
16 28.88 29.43
16.5 29.14 29.56
17 29.41 29.69
17.5 29.70 29.84
18 30.00 30.00

BMI, body mass index.