Table 1. Centiles and z scores for overweight and obesity corresponding to body mass index of 25 kg/m2 and 30 kg/m2 at age 18 years in six datasets, derived from fitted LMS curves Country Males Females Centile z score % above cut off point Centile z score % above cut off point Body mass index 25 kg/m2 Brazil 95.3 1.68 4.7 84.8 1.03 15.2 Great Britain 90.4 1.30 9.6 88.3 1.19 11.7 Hong Kong 88.3 1.19 11.7 90.2 1.29 9.8 Netherlands 94.5 1.60 5.5 93.5 1.52 6.5 Singapore 89.5 1.25 10.5 93.0 1.48 7.0 United States 81.9 0.91 18.1 83.5 0.97 16.5 Body mass index 30 kg/m2 Brazil 99.9 3.05 0.1 98.0 2.06 2.0 Great Britain 99.1 2.37 0.9 98.8 2.25 1.2 Hong Kong 96.9 1.86 3.1 98.2 2.10 1.8 Netherlands 99.7 2.71 0.3 99.7 2.73 0.3 Singapore 98.3 2.12 1.7 99.0 2.33 1.0 United States 96.7 1.84 3.3 96.0 1.76 4.0