Table 1.

Demographic and Clinical Characteristics of Patients With Tumors Classified by IASLC/ATS/ERS System

Characteristic	Total (N = 575)		Observation (surgery alone; n = 293)		ACT (n = 282)		P*
	No.	%	No.	%	No.	%
Sex							.18
Male	365	63	179	61	186	66
Female	210	37	114	39	96	34
Age, years							.56
< 55	200	35	101	34	99	35
55 to 64	216	38	119	41	97	34
≥ 65	159	28	73	25	86	31
Stage							.87
I	310	54	152	52	158	56
II	179	31	95	32	84	30
III	86	15	46	16	40	14
N stage							.78
N0	325	57	162	55	163	58
N1	174	30	89	30	85	30
N2	76	13	42	14	34	12
T stage							.52
1	88	15	42	14	46	16
2	446	78	230	79	216	77
3 to 4	41	7	21	7	20	7
Type of surgery							.08
Pneumonectomy	99	17	43	15	56	20
Other	476	83	250	85	226	80
WHO PS							.84
0	327	57	162	55	165	59
1 to 2	248	43	131	45	117	41
Adenocarcinoma subtype							.21
Lepidic	23	4	13	4	10	4
Acinar	148	26	74	25	74	26
Papillary	99	17	42	14	57	20
Micropapillary	39	7	25	9	14	5
Solid	266	46	139	47	127	45

Abbreviations: ACT, adjuvant chemotherapy; ATS, American Thoracic Society; ERS, European Respiratory Society; IASLC, International Association for the Study of Lung Cancer; PS, performance status.

^*χ² test was calculated from logistic regression model stratified by trial.