Table 6.

Comparison of athletes with concussion to healthy athletes on optokinetic and reaction time parameters. Optokinetic gain is defined as fast phase eye velocity / optokinetic stimulus velocity. Sample sizes below each variable represent the number of non-concussed and number of concussed, respectively, individuals in each analysis, representing the number of individuals from each group who could complete the task.

Optokinetic Gain	Non-concussed Median	Non-concussed Range	Concussed Median	Concussed Range	P-value
20°/s ccw (n=85 vs. n=24)	0.89	0.39 - 1.20	0.84	0.36 - 1.06	.14
60°/s ccw (n=85 vs. n=23)	0.55	0.13 - 0.92	0.44	0.24 - 0.81	.06
Reaction Times
Auditory (ms) (n=87 vs n=29)	246	143 - 552	241	138 - 775	.30*
Visual (ms) (n=87 vs n=29)	273	169 - 507	293	182 - 992	.02*
Dual Task (ms) (n=85 vs n=23)	482	261 - 880	522	318 - 1276	.03*

Bolded = statistically significant at alpha < .05

^*= One-tailed Mann-Whitney U results due to hypothesis that concussed individuals would perform worse