Table 3.

Improvement of pain release in the case group and control group.

	Pre-operative VAS score	Post-operative VAS score	P-valueb
Case group	7.8±1.5	3.1±0.5	<0.001*
Control group	7.5±1.9	4.8±1.1	<0.001*
P-valuea	0.738*	<0.001*

^*Using the rank sum test (Mann-Whitney test);

^acomparisons of the VAS score in the case group and the control group;

^bcomparisons of the preoperative VAS score and the postoperative VAS score in the two groups.