Table 2.

Baseline characteristics of those who became concussed during the study period compared against those of the entire sample.

	Prevalence (%)		p*
	Concussed (N = 89)	Overall (N = 3088)
Pediatric age	42.7	27.8	0.003
Previous head injury	43.8	29.2	0.003
COGNITIVE-FATIGUE
At least moderate	22.5	11.5	0.004
At least mild	83.1	72.2	0.024
VESTIBULAR
At least mild	44.9	30.2	0.004
MIGRAINE
At least moderate	4.5	1.4	0.039
At least mild	37.1	22.1	0.001
SLEEP
Severe	4.5	1.1	0.019
At least moderate	15.7	8.4	0.020

^*as determined by a binomial test.