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. 2020 Sep 3;34(5):2587–2593. doi: 10.21873/invivo.12076

Table II. Cox regression analysis of risk factors affecting overall survival (OS), in-field progression-free survival (PFS), and out-of-field PFS.

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CI: Confidence interval; GTV: gross tumor volume; HR: hazard ratio; LN: lymph node; NA: not applicable; SCC: squamous cell carcinoma. Bold values indicate statistical significance. Estimation of multivariate Cox regression models based on backward elimination for OS and outof- field PFS were not converged due to insufficient sample size, consequently no results were obtained. Multivariate analysis gave significant results with *HR=6.2 (95% CI=1.452-34.25), p=0.014; and **HR=0.842 (95% CI=0.707-0.985) p=0.032.