TABLE 2.

Sources of variation in FFM in participants <18 y old¹

	Unstandardized coefficient (B)	95% CI for B	P
Females
(constant)	−1.53	−6.21, 3.14	0.516
Age	1.90	1.63, 2.16	<0.001
FM	0.21	0.10, 0.31	<0.001
PAL	3.34	0.21, 6.47	0.037
Males
(constant)	−7.42	−14.45, −0.39	0.039
Age	2.00	1.57, 2.44	<0.001
FM	0.39	0.22, 0.57	<0.001
PAL	6.90	2.66, 11.15	0.002

¹Values are coefficients and P values from a multiple regression model of FFM (kg) as a function of age (y), FM (kg), and PAL, in females (n = 84, R² = 0.85) and males (n = 78, R² = 0.76). FFM, fat-free mass; FM, fat mass; PAL, physical activity level.