Table 4.

Multivariate Cox regression analysis of overall survival in the subgroups of patients have different prognosis

	Number of patients	Standard‐dose RT (n = 1125; 63%)	Dose‐escalated RT (n = 670; 37%)	HR (95% CI)	P
Expected favorable prognosis	448	202/223	183/225	0.784 (0.635–0.968)	0.024
Expected moderate prognosis	1139	711/753	365/386	0.808 (0.708–0.922)	0.002
Expected unfavorable prognosis	208	148/149	59/59	1.048 (0.772–1.424)	0.763

RT, radiotherapy; HR, hazard ratio; CI, confidence interval.