Table 1.

Patient characteristics.

	Observation group (n = 30)	Experimental group (n = 30)	t/x2	P
Sex			0.287	0.592
Male	18	20
Female	12	10
Age (years)	42-81	44-80
Average age (years)	60.58 ± 5.47	60.46 ± 5.39	0.086	0.932
Duration of disease (years)	1-23	2-24
Average duration of disease (years)	13.24 ± 4.32	13.22 ± 4.41	0.018	0.986