Magnetic Resonance Imaging Segmentation on the Basis of Boundary Tracking Algorithm in Lung Cancer Surgery

Table 2

Cox proportional hazards model analysis.

Covariant	Regression coefficient	Wald	95% CI
Tumor grade	−0.475	8.367	0.425–0.853	0.034
Treatment grouping	0.324	4.264	1.356–1.925	0.045