Table 1.

Clinicopathological characteristics according to normal or abnormal ABGs

Group		Patients	Normal ABG	Abnormal ABG	p value
			(n = 269)	(n = 145)
Age (years)	<70	233	164	69	0.009
	≥70	181	105	76
Gender	Male	250	159	91	0.469
	Female	164	110	54
BMI (Kg/m2)			22.2 ± 3.2	22.0 ± 3.4	0.539
Smoking History	Yes	261	165	96	0.326
	No	153	104	49
PS	0-1	384	250	134	0.844
	2	30	19	11
H–J classification	1-2	401	261	140	0.792
	3	13	8	5
Predicted post PFTsa)	≥40	383	253	130	0.105
	<40	31	16	15
Histology	Ad	302	203	99	0.326
	Sq	99	57	42
	Others	13	9	4
Differentiation	Well	133	87	46	0.898
	Mod/poor	281	182	99
p-stage	IA	233	160	73	0.068
	IB	181	109	72
Location	Rt. upper	133	89	44	0.815
	Rt. middle	28	17	11
	Rt. lower	86	59	27
	Lt. upper	92	57	35
	Lt. lower	74	46	28
Surgical procedure	Lobectomy	405	265	140	0.197
	Bilobectomy	9	4	5
Blood loss (g)			125 ± 141	137 ± 143	0.234
Operative time (min)			192 ± 65	203 ± 67	0.483
Adjuvant therapy	Yes	53	29	24	0.099
	No	361	240	121

ad adenocarcinoma; BMI body mass index; p-stage pathological stage; sq squamous carcinoma

^aPredicted postoperative values of FEV_1.0 or DL_CO <40 % are defined as high-risk results of pulmonary function tests