Table 1.

Mean age, height, weight, and DXA-derived total body fat mass and lean mass, and total body less head bone area for 648 boys and 642 girls with measurements of humeral size and dimensions^a

	Boys					Girls
	Prepubertal, N = 551		Early pubertal,N = 97		P value for difference between boys in pre- and early puberty	Prepubertal, N = 548		Early puberty, N = 94		P value for difference between girls in pre- and early puberty	P value for difference between prepubertal boys and girls	P value for difference between boys and girls in early puberty
	Mean	SD	Mean	SD		Mean	SD	Mean	SD
Birth length (cm)b	50.9	1.5	50.9	1.5	0.995	50.6	1.5	50.7	1.5	0.658	<0.001	0.316
Age at DXA (years)	9.8	0.3	9.9	0.3	0.615	9.8	0.3	9.8	0.3	0.946	0.631	0.602
Height (cm)	139.4	6.1	140.7	6.1	0.041	138.7	6.0	143.1	6.0	<0.001	0.081	0.011
Weight (kg)	34.1	7.1	34.9	7.1	0.303	34.2	7.3	39.2	7.3	<0.001	0.795	<0.001
TB fat mass (kg)	7.3	4.9	7.7	4.9	0.471	9.3	4.9	12.1	5.0	<0.001	<0.001	<0.001
TB lean mass (kg)	25.3	3.0	25.6	3.0	0.314	23.3	2.8	25.2	2.8	<0.001	<0.001	0.332
TBLH bone area (cm2)	1,141	154	1,161	155	0.261	1,113	157	1,217	158	<0.001	0.002	0.002

^aResults are shown separately for boys and girls, who are further subdivided according to results of Tanner stage self-completion questionnaire. P values shown are for the difference between prepubertal boys (Tanner stage 1) and boys in early puberty (Tanner stage 2); for the difference between prepubertal girls (Tanner stage 1) and girls in early puberty (Tanner stage 2); for the difference between prepubertal boys and girls; and for the difference between boys and girls in early puberty, all calculated by an unpaired Student’s t-test. For TB fat mass, TB lean mass and TBLH bone area results are adjusted for age at DXA measurement, by linear regression.

^bBirth length adjusted for gestational age and birth weight by linear regression.