Table 2. Multivariate analysis of risk factors for metastasis as the first recurrence event in NSCLC patients (Cox proportional hazards regression model).

Risk factors	b	SE (b)	Wald chi-square	P	RR	HR 95% CI
						low limit	High limit
Gender	0.604	0.411	2.167	0.141	1.830	0.818	4.092
Age	0.253	0.255	0.986	0.321	1.288	0.782	2.121
Pathological type	-0.595	0.339	3.067	0.080	0.552	0.284	1.073
T Status	-0.227	0.249	0.832	0.362	0.797	0.489	1.298
N status	0.584	0.231	6.395	0.011	1.792	1.140	2.817
Clinical stage	0.855	0.405	4.462	0.035	2.352	1.064	5.201
Histological grade	0.530	0.270	3.854	0.050	1.700	1.001	2.886
lncRNA-LET expression	-1.027	0.482	4.547	0.033	0.358	0.139	0.920

Note: HR, hazard ratio; CI, confidence interval.