Table 2.

Independent samples t-test of marginal adaptation on different marks.

	Levene's test for equality of variances		t-test for equality of means
	F	Sig.	t	df	Sig. (2-tailed)	Mean difference	Std. error difference
The gap of point A	.018	.894	.119	36	.906	.78947	6.61718
The gap of point O	.017	.897	−.668	36	.508	−3.78947	5.67101
The gap of point F	.892	.351	−.481	36	.633	−3.00000	6.23259
The gap of point O′	.134	.717	−.281	36	.781	−1.52632	5.43670