Table 2.

Parameter estimates from multiple linear regression analyses of DXA fat-free mass (FFM) and DXA-% fat (%BF) among girls 10–15 years of age

Variable	Parameter estimate(SE)	P Value	Standardized estimateb
Fat-free mass
Intercept	−2.43 (1.550)	0.119	0
Race/ethnicitya	1.59 (0.323)	<0.0001	0.11
Weight (kg)	0.15 (0.017)	<0.0001	0.35
Age (y)	0.81 (0.136)	<0.0001	0.14
RI (cm2·Ω−1)	0.52 (0.037)	<0.0001	0.56
Adjusted R2, %	93
Root mean standard error (RMSE)	1.85
Variable	Parameter estimate(SE)	P Value	Standardized estimateb
Percent fat
Intercept	22.87 (4.169)	<0.0001	0
Race/ethnicitya	−3.33 (0.870)	<0.0002	−0.15
Weight (kg)	0.85 (0.045)	<0.0001	1.31
Age (y)	−0.82 (0.367)	0.0272	−0.09
RI (cm2·Ω−1)	−0.76 (0.101)	<0.0001	−0.54
Adjusted R2, %	77
Root mean standard error (RMSE)	4.97

^aRace/ethnicity contrast: African-American = 1, others = 0.

^bStandardized regression coefficient