Table 2.

Comparative operation status between the case group and control group.

	Case group	Control group	P-value
Operative time (min)	133.1±19.0	137.8±28.2	0.465*
Intraoperative blood loss amount (ml)	94.4±12.6	112.8±15.5	<0.001*
Hospitalization days (day)	6.7±1.2	7.5±1.7	0.029*

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