TABLE 3.

Cox Proportional Hazard Model of Overall Survival

Covariate	Level	Hazard Ratio	P Value
Extent of lung resection	Segmental resection	1.33 (1.11–1.60)	0.002
	Wedge resection	1.54 (1.42–1.67)	<0.001
	Lobectomy	—	—
Facility type	Academic/research program (Includes NCI)	0.86 (0.75–0.99)	0.041
	Comprehensive community cancer program	0.92 (0.80–1.05)	0.194
	Community cancer program/other	—	—
Sex	Male	1.24 (1.15–1.33)	<0.001
	Female	—	—
Patient age		1.03 (1.02–1.03)	<0.001
Insurance	Not insured	0.83 (0.56–1.23)	0.356
	Private insurance	0.83 (0.76–0.92)	<0.001
	Govenment insurance	—	—
Income	<$30,000	1.33 (1.18–1.50)	<0.001
	$30,000–$34,999	1.30 (1.17–1.44)	<0.001
	$35,000–$45,999	1.14 (1.04–1.25)	0.007
	$46,000+	—	—
Charlson/Deyo score	2+	1.52 (1.36–1.69)	<0.001
	1	1.17 (1.08–1.27)	<0.001
	0	—	—
Histology	Unknown histology	1.16 (0.98–1.36)	0.080
	Squamous cell carcinomas	1.06 (0.96–1.16)	0.246
	Other tumorsa	0.78 (0.59–1.02)	0.074
	Large-cell carcinomas	1.09 (0.90–1.33)	0.366
	Adenosquamous carcinomas	1.18 (0.93–1.50)	0.171
	Adenocarcinomas	—	—
Grade	Unknown, high-grade dysplasia	1.33 (1.12–1.58)	<0.001
	3–4	1.57 (1.38–1.79)	<0.001
	2	1.43 (1.27–1.62)	<0.001
	1	—	—
Size of tumor (cm)		1.21 (1.10–1.34)	<0.001

Number of observations in the original data set = 28,241. Number of observations used = 6438. Tumor location was included in the multivariable model but not shown here.

^aIncluding but not restricted to, spindle cell carcinoma, mucoepidermoid malignancies, neuroendocrine, and mixed malignant tumors.