Table 2:

Difference between skeletal and chronological age in participant subgroups.

	Chronological Age	Bone Age	Age Diff	P-value
Sex				0.70
Male (n=43)	9.9 (7.4, 12.5) [6.0, 15.8]	10.5 (6.5, 14.0) [4.5, 17.0]	0.41 (−0.7, 1.9) [−2.9, 3.9]	0.02
Female (n=35)	9.3 (7.7, 11.9) [6.0, 14.0]	10.5 (8.0, 14.0) [4.0, 18.0]	0.50 (−0.4, 2.5) [−2.3, 4.4]	0.01
Tanner
1 (n=40)	8.0 (6.3, 9.2) [6.0, 12.0]	7.5 (5.8, 10.0) [4.0, 13.0]	−0.37 (−1.0, 0.5) [−2.9, 3.1]	0.22
2 (n=7)	12.6 (10.3, 12.2) [7.4, 13.4]	12.5 (10.5, 14.0) [8.5, 15.0]	1.1 (0.3, 1.9) [−0.08, 2.2]	0.03
3 (n=10)	11.2 (10.5, 13.2) [8.0, 15.8]	12.0 (10.5, 14.5) [8.5, 17]	0.39 (0.02, 1.2) [−1.4, 3.9]	0.07
4 (n=7)	11.1 (10.4, 12.5) [9.3, 13.5]	13.0 (10.5, 14.5) [10.0, 15.5]	1.4 (−0.4, 2.0) [−0.53, 4.4]	0.06
5 (n=14)	13.4 (13.1, 14.0) [10.5, 14.9]	16.5 (16.0, 16.5) [13.5, 18.0]	2.9 (2.5, 3.4) [0.86, 4.1]	0.001
BMI Percentile				0.002
Healthy Weight (n=33)	8.8 (6.6, 11.9) [6.0, 14.0]	10.0 (6.0, 10.5) [4.0, 16.5]	−0.03 (−0.9, 1.0) [−2.3, 2.6]	0.98
Overweight (n=13)	10.7 (8.2, 11.6) [6.4, 13.9]	10.5 (8.0, 14.0) [6.0, 18.0]	0.55 (0.2, 1.8) [−2.9, 4.4]	0.09
Obese (n=32)	10.4 (8.1, 13.2) [6.0, 15.8]	12.5 (8.0, 16.5) [5.0, 17.0]	1.4 (0.1, 3.0) [−1.0, 3.9]	0.0003
Height Percentile				0.004
<20th Percentile (n=46)	9.7 (7.1, 12.0) [6.0, 14.9)	9.8 (6.5, 13.0) [4.0, 17.0]	−0.05 (−1.0, 1.0) [−2.9, 3.7]	0.82
>20th Percentile (n=32)	10.0 (8.1, 12.6) [6.0, 15.8]	11.5 (8.8, 14.5) [6.0, 18.0]	1.3 (0.5, 2.5) [−0.6, 4.4]	<0.0001
Ethnicity				0.18
Not Hispanic (n=7)	11.1 (8.0, 13.4) [7.9, 13.5]	14.0 (7.5, 16.0) [7.5, 17.0]	0.86 (−0.4, 3.5) [−0.6, 4.4]	0.09
Hispanic (n=71)	9.7 (7.4, 12.1) [6.0, 15.8]	10.5 (7.5, 13.5) [4.0, 18.0]	0.41 (−0.5, 1.8) [−1.5, 3.7]	0.003
Shunt Status				0.28
No Shunt (n=16)	8.6 (7.9, 11.3) [6.2, 14.0]	9.0 (7.3, 11.3) [5.0, 17.0]	−0.07 (−1.0, 0.8) [−1.4, 4.4]	0.96
Shunt (n=62)	10.2 (7.4, 12.6) [6.0, 15.8]	10.5 (7.5, 14.0) [4.0, 18.0]	0.62 (−0.4, 2.0) [−2.9, 4.1]	0.0004

Values are presented as median (IQR) [range]. P-values are from Wilcoxon Sign Rank tests.