Table 2.

Proportion of subjects with symptoms provoked and associated sensitivities and specificities at different repetition increments of horizontal and vertical saccades and gaze stability testing.

	Concussed athletes (n=69)	Healthy controls (n=69)	p-value	Sensitivity	Specificity
Symptoms provoked at ≤10 repetitions, n (%)
Horizontal saccades*	17 (25)	0 (0)	<0.001	0.25	1.00
Vertical saccades	22 (32)	1 (1)	<0.001	0.32	0.99
Horizontal gaze stability	13 (19)	0 (0)	<0.001	0.19	1.00
Vertical gaze stability**	16 (23)	0 (0)	<0.001	0.23	1.00
Symptoms provoked at ≤20 repetitions, n (%)
Horizontal saccades*	34 (49)	1 (1)	<0.001	0.50	0.99
Vertical saccades	36 (52)	3 (4)	<0.001	0.52	0.96
Horizontal gaze stability	31 (45)	0 (0)	<0.001	0.45	1.00
Vertical gaze stability**	31 (45)	0 (0)	<0.001	0.45	1.00
Symptoms provoked at ≤30 repetitions, n (%)
Horizontal saccades*	47 (68)	32 (46)	0.007	0.69	0.54
Vertical saccades	51 (74)	32 (46)	<0.001	0.74	0.54
Horizontal gaze stability	49 (71)	18 (26)	<0.001	0.71	0.74
Vertical gaze stability**	50 (72)	16 (23)	<0.001	0.72	0.76

^*One concussed athlete had missing data for symptoms provoked by horizontal saccades.

^**One healthy control had missing data for symptoms provoked by vertical gaze stability.