Table 1.

Baseline characteristics of the patients

		Q group (n=30)	C group (n=29)	P
Age (years)		71.2±5.3	71.2±5.2	0.467
Sex ratio [case(%)]	male	22 (73.3%)	19 (65.5%)	0.514
	female	8 (26.7%)	10 (34.5%)
BMI (kg/m2)		21.6±3.2	22.1±3.3	0.527
ASA [case(%)]	I	7 (24.1%)	8 (26.7%)	0.697
	II	20 (69.0%)	17 (56.7%)
	III	2 (6.9%)	5 (16.6%)
Education (years)		7.2±2.0	7.1±2.2	0.910
Operative time (min)		203.0±58.3	205.7±55.3	0.856

Data are presented as the mean ± SD or number (%). Continuous data were compared by Student's t-test; categorical data were compared by Fisher's exact test; ranked data were compared by Mann-Whitney U test

BMI Body mass index, ASA American Society of Anesthesiologists