Table 1. Participant characteristics.

Variable	Total (n=333)	Group		Statistic
		Non-Self-Reporting (n=283)	Self-Reporting (n=50)	P-value	Effect Size
Male	220 (66%)	198 (70%)	22 (44%)	0.01*	0.003
Age (years)	20.60 (1.97)	20.67 (1.99)	20.22 (1.79)	0.14	1.96
Previous concussions	0.67 (1.08)	0.63 (1.06)	0.94 (1.15)	0.06	1.08
HADS
Anxiety subscale	4.95 (3.77)	4.33 (3.27)	8.50 (4.41)	<0.01**	−1.21
Depression subscale	1.97 (3.04)	1.55 (2.34)	4.34 (4.88)	<0.01**	−0.97
HADS total	6.92 (5.49)	5.88 (4.50)	12.84 (6.78)	<0.01**	−1.42
SF-12
Mental Component	18.72 (1.47)	18.76 (1.40)	18.48 (1.83)	0.21	0.19
Physical Component	13.04 (1.15)	12.98 (1.12)	13.42 (1.28)	0.01*	−0.39
SF-12 total	31.73 (1.97)	31.73 (1.91)	31.70 (2.33)	0.92	0.02

Variables expressed as mean (SD) except male expressed as n (%). HADS: Hospital Anxiety and Depression Scale, SF-12: Short Form 12.

^*Significant at P<0.05,

^**P<0.001