Table 4. Effects of clinical variables on survival rates.

	1-year survival	2-year survival	5-year survival
	Mean±SD	Mean±SD	Mean±SD
Age (year)
<60	0.8±0.1	0.5±0.7	0.2±0.1
≥60	0.8±0.1	0.6±0.6	0.2±0.1
Histopathologic diagnosis
Squamous cell carcinoma	0.8±0.1	0.7±0.1	0.2±0.1
Adenocarcinoma	0.9±0.1	0.7±0.1	0.4±0.1
Other	0.8±0.1	0.5±0.1	0.4±0.1
Stage
IIB	0.9±0.0	0.7±0.1	0.3±0.1
IIIA	0.6±0.1	0.4±0.1	0.3±0.8
T3 criteria
>7 cm	0.9±0.0	0.6±0.1	0.1±0.1
Chest wall invasion	0.9±0.1	0.6±0.1	0.5±0.1
Other invasions	0.6±0.1	0.5±0.1	0.4±0.1
Lymph node invasion
N0	0.1±0.0	0.8±0.1	0.3±0.1
N1	0.6±0.1	0.5±0.1	0.5±0.1
N2	0.6±0.1	0.2±0.1	0.0±0.0
Type of operation
Lobectomy	0.9±0.0	0.7±0.1	0.3±0.1
Pneumonectomy	0.7±0.1	0.4±0.1	0.1±0.1
Other	0.8±0.1	0.6±0.2	0.6±0.2
Chemotherapy
Yes	0.9±0.0	0.7±0.1	0.2±0.1
No	0.5±0.1	0.3±0.1	0.3±0.1
Radiotherapy
Yes	0.9±0.0	0.7±0.1	0.4±0.1
No	0.8±0.1	0.5±0.1	0.1±0.1
Recurrence
Yes	0.8±0.1	0.3±0.1	0.0±0.0
No	0.8±0.1	0.7±0.1	0.3±0.1
SD: Standard deviation.