Table 3.

Percent Body Fat (PBF) by Age from 8 to 18 Years and Decades of Birth.

Age	Birth Decade (BD)
(years)	1960≤BD<1970			1970≤BD<1980			1980≤BD<1990			1990≤BD<2000
Boys	N	mean	std	n	mean	std	n	mean	std	n	mean	std
8≤age<9	6	12.96*	10.34	5	17.57*	12.46	34	15.20*	9.89	33	18.23*	11.21
9≤age<10	9	12.65*	7.38	21	16.97*	9.26	40	17.25*	11.83	26	22.97*	10.12
10≤age<11	9	15.86*	7.64	31	18.22*	9.79	34	17.71*	12.17	35	23.05*	11.70
11≤age<12	20	14.96*	5.16	41	18.95*	9.21	45	19.45*	9.65	32	21.56*	9.54
12≤age<13	28	16.67*	6.48	39	20.18*	7.86	36	20.00*	10.14	37	24.64*	10.39
13≤age<14	24	14.15*	6.51	42	19.58*	7.77	34	18.82*	9.25	28	23.06*	9.57
14≤age<15	25	12.43*	5.35	37	18.42*	11.32	47	18.30*	9.41	28	23.49*	11.49
15≤age<16	27	8.54*	4.69	44	15.54*	8.09	38	16.66*	10.31	23	18.77*	8.01
16≤age<17	38	10.70*	7.77	40	14.52*	7.58	35	15.14*	7.95	19	19.48*	8.27
17≤age<18	26	10.11*	4.93	43	12.39*	7.75	42	13.19*	7.34	14	18.56*	5.87
Girls
8≤age<9	5	16.45*	7.45	8	28.61*	4.78	36	18.91*	10.33	30	26.09*	12.21
9≤age<10	4	22.32*	11.73	20	22.35*	9.69	38	21.22*	9.63	25	24.88*	10.20
10≤age<11	7	18.58*	11.58	30	23.55*	8.26	49	23.20*	8.54	21	26.36*	10.27
11≤age<12	16	22.93*	7.27	33	23.80*	7.77	48	23.45*	8.83	15	28.24*	8.29
12≤age<13	19	23.71*	4.90	34	24.71*	6.85	46	24.70*	7.69	17	27.87*	8.83
13≤age<14	26	22.3*	6.62	34	24.28*	8.01	41	24.06*	8.84	17	25.13*	6.8
14≤age<15	30	23.98*	7.72	32	22.77*	7.4	41	24.93*	8.23	15	30.91*	6.73
15≤age<16	22	27.25*	7.49	42	23.74*	6.3	28	26.35*	6.89	17	30.18*	9
16≤age<17	27	25.74*	7.69	39	25.21*	7.64	40	27.79*	8.24	10	30.08*	7.83
17≤age<18	30	25.58*	8.15	36	25.17*	7.07	46	30.08*	7.79	10	31.46*	7.78

^*Mean BMI significantly less than mean BMI for 1990–2000 (p-value < 0.05).