Table 4.

 International cut-off points for BMI for thinness grades 1, 2, and 3 by sex for exact ages between 2 and 18 years, defined to pass through BMI of 16, 17, and 18.5 at age 18, obtained by averaging data from Brazil, Great Britain, Hong Kong, Netherlands, Singapore, and US

Age (years)	Boys				Girls
	16	17	18.5		16	17	18.5
2.0	13.37	14.12	15.14		13.24	13.90	14.83
2.5	13.22	13.94	14.92		13.10	13.74	14.63
3.0	13.09	13.79	14.74		12.98	13.60	14.47
3.5	12.97	13.64	14.57		12.86	13.47	14.32
4.0	12.86	13.52	14.43		12.73	13.34	14.19
4.5	12.76	13.41	14.31		12.61	13.21	14.06
5.0	12.66	13.31	14.21		12.50	13.09	13.94
5.5	12.58	13.22	14.13		12.40	12.99	13.86
6.0	12.50	13.15	14.07		12.32	12.93	13.82
6.5	12.45	13.10	14.04		12.28	12.90	13.82
7.0	12.42	13.08	14.04		12.26	12.91	13.86
7.5	12.41	13.09	14.08		12.27	12.95	13.93
8.0	12.42	13.11	14.15		12.31	13.00	14.02
8.5	12.45	13.17	14.24		12.37	13.08	14.14
9.0	12.50	13.24	14.35		12.44	13.18	14.28
9.5	12.57	13.34	14.49		12.53	13.29	14.43
10.0	12.66	13.45	14.64		12.64	13.43	14.61
10.5	12.77	13.58	14.80		12.78	13.59	14.81
11.0	12.89	13.72	14.97		12.95	13.79	15.05
11.5	13.03	13.87	15.16		13.15	14.01	15.32
12.0	13.18	14.05	15.35		13.39	14.28	15.62
12.5	13.37	14.25	15.58		13.65	14.56	15.93
13.0	13.59	14.48	15.84		13.92	14.85	16.26
13.5	13.83	14.74	16.12		14.20	15.14	16.57
14.0	14.09	15.01	16.41		14.48	15.43	16.88
14.5	14.35	15.28	16.69		14.75	15.72	17.18
15.0	14.60	15.55	16.98		15.01	15.98	17.45
15.5	14.86	15.82	17.26		15.25	16.22	17.69
16.0	15.12	16.08	17.54		15.46	16.44	17.91
16.5	15.36	16.34	17.80		15.63	16.62	18.09
17.0	15.60	16.58	18.05		15.78	16.77	18.25
17.5	15.81	16.80	18.28		15.90	16.89	18.38
18.0	16.00	17.00	18.50		16.00	17.00	18.50