Table 1.

Participant Characteristics for Each Chronologic Age Group

Age Group	No.	Mean ± SD
		Age, y	Body Mass, kg	Height, cm	Sitting Height, cm	Maturity Offset
U11	58	11.2 ± 0.6	37.8 ± 5.8	144.0 ± 6.7	75.9 ± 4.8	−2.6 ± 0.5
U12	45	12.1 ± 0.6	40.3 ± 5.7	149.2 ± 5.9	79.3 ± 4.7	−2.0 ± 0.6
U13	56	12.8 ± 0.6	44.7 ± 8.8	155.8 ± 9.1	83.8 ± 6.8	−1.2 ± 0.7
U14	74	14.0 ± 0.5	50.2 ± 9.2	162.8 ± 9.4	84.2 ± 13.0	−0.1 ± 0.9
U15	64	15.3 ± 0.6	60.9 ± 8.4	172.2 ± 7.6	91.6 ± 5.3	1.0 ± 0.6
U16	60	16.1 ± 0.6	65.3 ± 8.1	175.8 ± 7.0	92.1 ± 5.7	1.8 ± 0.6
U18	43	17.5 ± 0.8	72.0 ± 6.5	178.9 ± 5.9	93.2 ± 4.2	2.9 ± 0.7