Table 3.

Regression analysis of fat free mass, and fat free mass index by age in white, and black men and women. The Third National Health and Nutrition Examination Survey (NHANES III 1988–94).

		Men			Women
	Characteristics	Beta Coefficient	Standard Error	P Value	Beta Coefficient	Standard Error	P Value
FFM (kg)
	Ethnicity	-0.338	0.276	0.227	-0.821	0.313	0.012
	Age (yrs)	-0.109	0.011	<0.001	-0.125	0.021	<0.001
	BMI (kg/m2)	1.527	0.039	0.001	1.053	0.032	<0.001
FFMI (kg/m2)
	Ethnicity	-0.333	0.070	<0.001	-0.456	0.147	0.003
	Age (yrs)	0.017	0.003	<0.001	-0.015	0.005	0.004
	Body Weight (kg)	0.122	0.003	<0.001	0.479	0.006	<0.001

Note: Statistical significance was set at P ≤ 0.05; Fat free mass model adjusted for body mass index; and fat free mass index model adjusted for body weight. FFM indicates fat free mass; FFMI indicates fat free mass index; and BMI indicates body mass index.