Table 1. General data of patients in the two groups and their conditions during the operation (n=18 in each group, $\overline{x}\pm s$).

Item	C group	P group	P
Male/female	12/6	13/5	0.50
Age (year)	57.6±9.4	59.6±7.2	0.58
BMI (kg/m2)	32.7±1.7	32.5±2.2	0.55
FEV1	86.2±8.0	89.1±9.0	0.21
FEV1/FVC	71.9±9.2	71.3±9.6	0.59
FVC (%)	82.8±8.6	84.9±10.2	0.49
MVV (%)	75.8±11.2	74.6±9.7	0.58
Smoking	8/10	10/6	0.74
Urine (mL/kg/h)	1.7±1.1	1.6±0.9	0.234
Hb (g/mL)	137.8±11.1	135.4±10.7	0.57
Left/right (surgery)	4/14	6/12	0.356
Infusion volume (mL)	2,326±551	2,473±651	0.58
Bleeding volume (mL)	196±126	222±146	0.56
Operation time (min)	171±43	187±40	0.39
Time of OLV (min)	125±31	140±31	0.38

BMI, body mass index; FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity; MVV, maximum ventilatory volume; OLV, one-lung ventilation.