Table 1.

Demographic Information of Participants

Variable	Soccer players (n = 16)	Controls (n = 14)
Age (years, mean ± SD [range])	15.7 (± 0.7) [15 to 17]	14.8 (± 1.1) [14 to 17]
History of mTBI (n, %)	5 (31%)	1 (7%)
Number of test days (mean ± SD [range])	7.8 (± 2.6) [3 to 11]	4.1 (± 2.7) [1 to 7]
Time period	04/2015–05/2015	02/2015–04/2015
Head impacts per session (number, mean (± SD) [range])	7.2 (± 2.8) [3 to 15]	n/a
Years of training (years, mean (± SD) [range])	10.6 (± 1.1) [9 to 13]	8.8 (± 1.5) [8 to 11]
BMI (mean (± SD) [range])	21.1 (± 1.6) [18.7 to 23.8]	19.3 (± 0.6) [18.6 to 19.9]

SD, standard deviation; mTBI, mild traumatic brain injury; BMI, body mass index.