Table 1.

Comparison of general data between the two groups

Item	Control group (n=71)	Observation group (n=71)	χ2/t	P
Gender (M/F, cases)	38/33	41/30	0.2568	0.6123
Age (x̅±s, years old)	41.59±4.96	43.15±6.06	1.6786	0.0955
Courses of disease	7.04±2.05	6.58±2.21	1.2858	0.2006
Position of catheter (L/R, number of cases)	42/29	38/33	0.4581	0.4985