Table IV.

Cox regression analysis of independent factors in the prognosis of patients with lung cancer.

Variables	β	SE	Wald χ2	P-value	OR value	95% CI
HIF-1α expression	1.777	0.720	6.090	0.014	5.910	1.441	24.230
Advanced age	0.836	0.277	9.086	0.003	2.307	1.340	3.397
Clinical stage	−3.548	1.111	10.202	0.001	0.029	0.003	0.254
Chemotherapy or not	−1.488	0.366	16.523	<0.001	0.226	0.110	0.463

CI, confidence interval; HIF-1α, hypoxia-inducible factor-1α; β, estimated regression coefficient; SE, standard error; Wald, Wald statistic.