Table 1. Clinicopathologic characteristics of the patients.

Variables	Category	All patients (N=1,166), n [%]
Age	Median [range]	66 [23–86]
Sex	Men	627 [54]
	Women	539 [46]
Smoking index (pack-year)	<40	802 [69]
	≥40	364 [31]
Comorbidity	Yes	230 [20]
	No	936 [80]
Respiratory function
% FVC	≥80%	1,154 [99]
	<80%	12 [1]
FEV1.0%	≥70%	894 [77]
	<70%	272 [23]
Clinical T factor	T1	672 [58]
	T2–4	494 [42]
Clinical N factor	N0	859 [74]
	N1–2	307 [26]
Histology	Adenocarcinoma	914 [78]
	Squamous cell ca.	153 [13]
	Others	99 [8]
Operative approach	Thoracotomy (TH)	844 [72]
	Thoracoscopic (TS)	322 [28]

% FVC, % forced vital capacity; FEV1.0%, forced expiratory volume 1.0%.