Table 1.

Patient’s basic information and surgical related data

		GA (n = 253)	LA (n = 111)	P Value	Effect size
NNIS				0.1270	0.1054
	0	205(81.03%)	99(89.19%)
	1	40(15.81%)	11(9.91%)
	2	8(3.16%)	1(0.90%)
ASA score				0.4368	0.8800
	P1	105(41.50%)	43(38.74%)
	P2	141(55.73%)	67(60.36%)
	P3	7(2.77%)	1(0.90%)
Pathology				0.5625	0.3600
	Pleomorphic adenoma	89(35.18%)	40(36.03%)
	Warthin’s tumor	85(33.60%)	32(28.83%)
	Other benign tumors	58(22.92%)	32(28.83%)
	malignant tumor	21(8.30%)	7(6.31%)
Tumor location				0.0122*	0.4000
	Deep lobe	146(57.71%)	48(43.24%)
	Superficial lobe	107(42.29%)	63(56.67%)
Age(years)		55.40 ± 0.96	52.55 ± 1.34	0.0966	0.0870
Operation time(minutes)		108.20 ± 4.42	88.96 ± 3.77	0.0010**	0.3930
Size of tumor(cubic millimeter)		33.49 ± 3.82	18.63 ± 1.79	0.0005**	0.2210
Incision length(cm)		6.40 ± 0.12	5.50 ± 0.15	< 0.0001***	0.2160