TABLE 1

Summary of Demographic Information for Participants by Age Group and Competition Level (n = 397)

AgeTotal, n = 397
12–14, n = 15915–18, n = 238
Age, y, mean (SD)12.79 (1.12)16.25 (1.03)*14.73 (1.99)
Girls, n (%)24 (15.1)43 (18.1)67 (16.9)
Height, cm, mean (SD)158.59 (10.13)174.46 (11.06)*167.40 (12.52)
Weight, kg, mean (SD)50.10 (11.82)69.59 (11.99)*61.00 (15.60)
No. previous concussions, mean (SD)0.27 (0.57)0.48 (0.93)*0.39 (0.79)
Learning disorder, n (%)2 (1.3)9 (3.8)11 (2.8)
ADD/ADHD, n (%)6 (3.8)12 (5.0)18 (4.5)
Migraine/headache, n (%)18 (11.3)33 (13.9)51 (12.8)
Games, n (%)2785 (49.4)**7800 (44.0)10 585 (45.3)
Checking not allowed, n (%)37 (23.3)67 (28.2)104 (26.2)
Western Pennsylvania site, n (%)142 (89.3)218 (84.2)104 (26.2)
Boston, Massachusetts, site, n (%)10 (6.3)21 (8.8)31 (7.8)
Birmingham, Alabama, site, n (%)7 (4.4)20 (8.4)104 (26.2)
  • * P < .05; **P < .01.