Table 1.

Demographic information of 127 lung adenocarcinoma patients, 123 smoker controls and 170 benign nodule controls.

Characteristics	Lung adenocarcinoma	Smoker controls	Benign nodule control
			Emphysema	Granuloma	Stable nodule
N	127	123	47	50	73
Mean age	70 ± 10	64 ± 11	68 ± 8	63 ± 12	62 ± 10
Sex
Male	54	52	21	25	28
Female	73	70	25	25	45
No data		1	1
Smoking history
Never	11	0	1	8	2
Former	82	91	30	28	44
Current	20	31	15	8	26
No data	14	1	1	6	1
Mean pack years	31 ± 27	33 ± 24	50 ± 32	28 ± 47	30 ± 19
Nodules Size, cm	2.3 ± 1.4	0	0.4 ± 0.3	1.9 ± 1.6	0.6 ± 0.3
Stage
I	84
II	29
III	14