General information		Experimental group	Reference group	t/x2	P
gender	man	16	18	0.251	>0.05
	woman	16	14
Average age		46.30 ± 5.36	46.28 ± 5.31	0.015	>0.05
Mean course of illness		3.55 ± 1.36	3.51 ± 1.32	0.067	>0.05
by stages	Phase I	9	8	0.275	>0.05
	Stage II	15	17
	Stage III	6	5