Table 4.

Results of the multivariate analysis of variance among three groups.

Variables	Sub-factors	df	F	p	η2	Post-hoc
Expertise	Performance	2	16.544	0.000***	0.181	a < b < c
	Personality and ethics	2	2.487	0.087	0.032	–
	Teaching skill	2	7.216	0.001**	0.088	a < b, c
	Basic principle	2	0.479	0.620	0.006	–
Instructor credibility		2	14.661	0.000***	0.164	a < b < c
Lesson participation intention		2	12.592	0.000***	0.144	a < b, c

^*p < 0.05, ^**p < 0.01, ^***p < 0.001.