Table 5. Cox proportional hazard model to estimate the factors affecting patients’ survival following LDP.

	Hazard ratio	95% Confidence interval	p value
Age, year	0.932	0.891 to 0.975	0.002
Size, cm	1.311	1.002 to 1.714	0.049
N stage
N0	Reference
N1	3.113	1.330 to 7.286	0.009
Combined resection
No	Reference
Yes	4.503	1.215 to 16.697	0.024
Planned adjuvant treatment
Complete	Reference
Incomplete	4.448	1.847 to 10.713	0.001