Table 2.

Results of reliability analyses

Scale	Item	Cronbach’s αª	McDonald’s ω	Cronbach’s α if item omittedª	ITCª	CITC
Physical	Headache	0.93	0.94	0.94	0.72	0.63
	Nausea			0.92	0.83	0.78
	Balance problems			0.92	0.87	0.82
	Dizziness			0.92	0.87	0.82
	Visual problems (double vision, blurring)			0.93	0.81	0.74
	Move in a clumsy manner			0.93	0.81	0.75
	Sensitivity to light			0.92	0.86	0.82
	Sensitivity to noise			0.92	0.84	0.78
Emotional	Irritability	0.91	0.92	0.89	0.87	0.76
	Sadness			0.88	0.89	0.8
	Nervousness			0.88	0.88	0.78
	Feeling more emotional			0.87	0.90	0.81
Cognitive	Feeling mentally foggy	0.94	0.95	0.94	0.84	0.76
	Difficulty concentrating			0.94	0.85	0.78
	Difficulty remembering			0.93	0.89	0.84
	Get confused with directions or tasks			0.93	0.88	0.83
	Answer questions more slowly than usual			0.92	0.91	0.87
	Feeling slowed down			0.93	0.90	0.84
Fatigue	Fatigue	0.90	0.90	0.86	0.90	0.78
	Drowsiness			0.82	0.93	0.84
	Sleeping more than usual			0.87	0.90	0.77
Total		0.97	0.97	-	-	-

ªStandardized α coefficients are used. (C)ITC (corrected) item-total correlations. Values in bold are within acceptable cut-offs (i.e., α and ω greater than or equal to 0.70, α if an item omitted do not exceeding the initial α of the scale and [C]ITC greater than or equal to 0.40)