Upper extremity (n = 31)

Lower extremity (n = 13)

Head (n = 11)

Back (n = 1)

Total (n = 56)

Gender

Male

14

6

3

0

23

Female

17

7

8

1

33

Mean age (SD)

15.2 (1.6)

15.3 (1.3)

15.6 (1.7)

16

15.3 (1.5)