Table 2 Results of a paired-samples t-test for Oculus-motor discomfort scores based on the system

Paired samples t-test
All condition(N=40)		Matching difference			Degree of Freedom	Significance probability
		Average	Standard Deviation	Standard error of Average		One-side probability	Two-side probability
Matching 1	N_2 – N_1	3.790	11.515	1.820	39	0.022	*0.044
Matching 2	N_3 – N_1	4.927	11.960	1.891	39	0.006	*0.013
Matching 3	N_4 – N_1	9.096	15.179	2.400	39	0.000	*0.001

HMD(N=20)		Matching difference			Degree of Freedom	Significance probability
		Average	Standard Deviation	Standard error of Average		One-side probability	Two-side probability
Matching 1	N_2 – N_1	3.790	14.020	3.135	19	0.121	0.242
Matching 2	N_3 – N_1	1.516	13.825	3.091	19	0.315	0.629
Matching 3	N_4 – N_1	9.854	19.690	4.403	19	0.019	*0.037

Non-HMD(N=20)		Matching difference			Degree of Freedom	Significance probability
		Average	Standard Deviation	Standard error of Average		One-side probability	Two-side probability
Matching 1	N_2 – N_1	3.790	8.695	1.944	19	0.033	0.066
Matching 2	N_3 – N_1	8.338	8.833	1.975	19	0.000	*0.000
Matching 3	N_4 – N_1	8.338	9.169	2.050	19	0.000	*0.001