Table 1.

The clinically related data of IMN and EPR groups (x±s)

Index	IMN	EPR	t value	P
*, in IMN group, preoperational vs. postoperational VAS scores, P=0.001; in EPR group, preoperational vs. postoperational VAS scores, P=0.001, which was statistically significant.
Case number	21	13
Operation time (min)	59.5±6.1	75.4±7.8	37.0	0.001
Amount of bleeding (mL)	571.4±96.9	753.8±143.6	231.0	0.001
VAS*
Preoperation	8.7±0.7	8.7±0.6	27.0	0.772
Postoperation	2.7±0.7	2.5±0.6	19.0	0.363
Harris score	70.3±4.0	76.7±3.4	260.0	0.002
KPS	65.7±10.7	71.5±10.6	324.0	0.134
APACHE Ⅱ	11.2±5.2	10.1±4.7	221.0	0.117