Table 5. Cox proportional hazards model analysis.

Factors	β	SE	Wald	P	RR	95% CI
						Low	Up
T stage	0.667	0.331	5.479	0.025	1.853	1.241	2.305
N stage	0.735	0.382	4.816	0.033	2.108	1.618	2.846
M stage	0.891	0.293	4.472	0.017	1.612	1.092	1.985
Age	0.598	0.268	5.015	0.041	1.449	1.086	1.792
Ratio*	1.634	0.194	6.624	0.006	1.969	1.374	2.901

*, ratio of serum levels of microRNA-21 and microRNA-10a.