Table 2.

Males: R² and RMSE overall and in subgroups in full sample (n =11 884), NHANES 1999–2006

Modela	Overall		Age				Race/Ethnicity						Age × Race/Ethnicity
			8–19 years		≥20 years		White		Black		Mexican		White-Boys		White-Men		Black-Boys		Black-Men		Mexican-Boys		Mexican-Men
	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE	R2	RMSE
A	0.845	2.52	0.886	2.63	0.821	2.49	0.839	2.52	0.864	2.54	0.835	2.46	0.881	2.59	0.816	2.50	0.889	2.67	0.845	2.49	0.889	2.65	0.787	2.38
B	0.842	2.55	0.882	2.67	0.818	2.51	0.836	2.54	0.863	2.56	0.832	2.48	0.876	2.65	0.814	2.52	0.884	2.72	0.845	2.49	0.889	2.65	0.783	2.41
C	0.793	2.91	0.839	3.12	0.765	2.86	0.786	2.90	0.822	2.91	0.789	2.77	0.832	3.07	0.760	2.86	0.844	3.16	0.804	2.80	0.845	3.14	0.741	2.63
D	0.840	2.56	0.879	2.70	0.817	2.52	0.834	2.56	0.860	2.58	0.832	2.48	0.872	2.69	0.813	2.53	0.883	2.73	0.841	2.52	0.887	2.67	0.783	2.40
E	0.769	3.08	0.807	3.42	0.743	2.99	0.764	3.05	0.790	3.16	0.764	2.94	0.801	3.35	0.740	2.97	0.808	3.50	0.772	3.02	0.817	3.41	0.719	2.74
F	0.840	2.57	0.882	2.67	0.814	2.54	0.833	2.57	0.859	2.59	0.832	2.48	0.876	2.64	0.809	2.55	0.884	2.73	0.839	2.53	0.890	2.64	0.782	2.41
G	0.842	2.55	0.882	2.67	0.817	2.52	0.835	2.55	0.862	2.56	0.831	2.48	0.875	2.65	0.813	2.53	0.885	2.71	0.843	2.50	0.889	2.65	0.781	2.41
H	0.805	2.83	0.856	2.95	0.775	2.79	0.796	2.83	0.827	2.87	0.797	2.72	0.849	2.92	0.768	2.81	0.862	2.97	0.800	2.83	0.855	3.03	0.747	2.59
I	0.836	2.59	0.878	2.72	0.811	2.56	0.829	2.59	0.856	2.62	0.829	2.50	0.872	2.68	0.806	2.57	0.880	2.77	0.836	2.56	0.887	2.68	0.778	2.43
J	0.766	3.10	0.804	3.44	0.741	3.00	0.761	3.07	0.789	3.17	0.763	2.94	0.797	3.39	0.738	2.99	0.806	3.51	0.772	3.02	0.816	3.41	0.717	2.75
K	0.682	3.61	0.735	4.00	0.647	3.50	0.675	3.58	0.699	3.78	0.695	3.34	0.724	3.95	0.643	3.49	0.737	4.10	0.666	3.65	0.747	4.00	0.649	3.06
L	0.764	3.11	0.801	3.47	0.738	3.01	0.759	3.08	0.784	3.20	0.762	2.95	0.793	3.42	0.736	3.00	0.802	3.55	0.767	3.05	0.815	3.42	0.716	2.75
M	0.789	2.94	0.854	2.97	0.751	2.94	0.778	2.96	0.810	3.00	0.792	2.76	0.846	2.95	0.743	2.96	0.863	2.96	0.771	3.02	0.862	2.96	0.732	2.67
N	0.664	3.71	0.728	4.06	0.623	3.62	0.658	3.67	0.675	3.93	0.682	3.41	0.716	4.00	0.621	3.59	0.730	4.15	0.631	3.84	0.738	4.07	0.632	3.13
O	0.430	4.84	0.285	6.57	0.521	4.07	0.447	4.66	0.444	5.14	0.371	4.79	0.261	6.46	0.530	4.00	0.332	6.52	0.549	4.24	0.343	6.45	0.592	3.30

Abbreviations: BMI, body mass index; NHANES, National Health and Nutrition Examination Survey; RMSE, root mean square error. Model A: age, race, height, weight, BMI, triceps, subscapular, waist, calf circumference, arm circumference, thigh circumference, arm length and leg length; Model B: age, race, height, weight, BMI, triceps, subscapular, waist, calf circumference, arm circumference and thigh circumference; Model C: age, race, height, weight, BMI, subscapular, waist, calf circumference, arm circumference and thigh circumference; Model D: age, race, height, weight, BMI, triceps, waist, calf circumference, arm circumference and thigh circumference; Model E: age, race, height, weight, BMI, waist, calf circumference, arm circumference and thigh circumference; Model F: age, race, height, weight, BMI, triceps, subscapular, waist and calf circumference; Model G: age, race, height, weight, BMI, triceps, subscapular, waist and arm circumference; Model H: age, race, height, weight, BMI, triceps, subscapular and arm circumference; Model I: age, race, height, weight, BMI, triceps and waist; Model J: age, race, height, weight, BMI, waist and arm circumference; Model K: age, race, height, BMI and arm circumference; Model L: age, race, height, weight, BMI and waist; Model M: age, race, height, weight, BMI and triceps; Model N: age, race, height, weight and BMI; Model O: BMI.

^aAll candidate variables were retained by the selection process for all models.