Table 2:

Cox proportional hazards model for post-operative survival by surveillance intensity adjusted for patient and treatment characteristics.

	HR (95% CI)	p-value
Surveillance group: 3-month	(reference)	0.135
6-month	1.16 (0.99, 1.36)
1-year	1.06 (0.86, 1.31)
Histology: Adenocarcinoma	(reference)	0.809
Squamous histology	1.03 (0.88, 1.19)
Other histology	0.95 (0.75, 1.20)
Surgery: Lobectomy	(reference)	0.122
Pneumonectomy	0.93 (0.65, 1.33)
Segmentectomy	1.40 (0.93, 2.13)
Wedge resection	1.20 (0.99, 1.44)
Any chemotherapy	0.93 (0.78, 1.11)	0.697
Any radiation	1.29 (1.01, 1.65)	0.043
Age (per decade)	1.26 (1.15, 1.39)	0.000
Sex: Male	(reference)	0.026
Female	0.85 (0.74, 0.98)
Chronic obstructive pulmonary disease	1.24 (1.05, 1.47)	0.012
Congestive heart failure	1.78 (1.35, 2.33)	0.000
Coronary artery disease	1.03 (0.88, 1.21)	0.715
Diabetes	1.15 (0.96, 1.38)	0.122
Peripheral vascular disease	1.31 (1.04, 1.64)	0.023
Psychiatric	1.25 (0.98, 1.60)	0.067
Substance abuse	1.47 (1.13, 1.91)	0.004