Table 3.

Cox proportional hazards model identifying factors associated with long-term mortality in patients with clinical stage I NSCLC

Patient and Treatment Variables	Hazard ratio (HR) with 95% Confidence Interval (CI)	p-Value
Age	1.03 (1.03–1.03)	<0.001
Male gender	1.37 (1.33–1.42)	<0.001
Caucasian Race	1.08 (1.02–1.15)	0.007
Academic Facility	0.96 (0.93–0.99)	0.03
Urban Location	0.96 (0.92–0.99)	0.02
Income >$35,000	0.90 (0.87–0.93)	<0.001
Charlson Score =1	1.14 (1.10–1.18)	<0.001
Charlson Score =2	1.49 (1.42–1.56)	<0.001
Tumor Size (mm)	1.03 (1.02–1.03)	<0.001
Clinical T2 Status	1.24 (1.19–1.28)	<0.001
Positive Tumor Margin	1.49 (1.39–1.60)	<0.001
Upstaged Tumor	1.85 (1.78–1.92)	<0.001
Number of Lymph Nodes Examined (n) – all patients
n=0	1.00	n/a
n=1–3	0.80 (0.74–0.86)	<0.001
n=4–6	0.69 (0.65–0.75)	<0.001
n=7–9	0.67 (0.62–0.72)	<0.001
n=10–12	0.64 (0.59–0.69)	<0.001
n=13–15	0.65 (0.60–0.71)	<0.001
n=16–18	0.62 (0.56–0.69)	<0.001
n>18	0.66 (0.61–0.72)	<0.001
Number of Lymph Nodes Examined – Non-upstaged only
n=0	1.00	n/a
n=1–3	0.78 (0.72–0.84)	<0.001
n=4–6	0.69 (0.64–0.74)	<0.001
n=7–9	0.65 (0.60–0.71)	<0.001
n=10–12	0.64 (0.58–0.69)	<0.001
n=13–15	0.66 (0.60–0.73)	<0.001
n=16–18	0.64 (0.57–0.72)	<0.001
n>18	0.67 (0.61–0.74)	<0.001