Table 4.

Comparison of CVR and PI between the two groups before and after treatment

Group	Time	CVR (%)	PI
Observation group (n=65)	Before treatment	19.34±3.25	0.93±0.15
	After treatment	39.80±7.53*	0.70±0.09*
	t	20.113	10.600
	P	0.000	0.000
Control group (n=62)	Before treatment	19.85±3.11	0.92±0.17
	After treatment	30.32±6.57	0.80±0.11
	t	11.342	4.666
	P	0.000	0.000

Note: Compared with the control group in the same period, t-test;

^* P<0.05.