Table 4. Pairwise comparison of ROC curves among T stage, GTVp, GTVnx for LFFR, OS, DFFR, DFS.

Results	LFFR	OS	DFFR	DFS
T-stage vs. GTVp
Difference between areas	0.0172	0.00247	0.0427	0.0348
Standard error	0.0473	0.0481	0.122	0.0402
95% CI	−0.0756 to 0.110	−0.0919 to 0.0968	−0.196 to 0.281	−0.0439 to 0.114
Z statistic	0.363	0.0513	0.351	0.867
Significance level	0.7166	0.9591	0.7259	0.3861
T-stage vs. GTVnx
Difference between areas	0.0028	0.0213	0.0403	0.0212
Standard error	0.047	0.0479	0.05	0.0401
95% CI	−0.0894 to 0.0950	−0.0726 to 0.115	−0.0576 to 0.138	−0.0574 to 0.0997
Z statistic	0.0595	0.445	0.807	0.528
Significance level	0.9526	0.6563	0.4198	0.5975
GTVp vs. GTVnx
Difference between areas	0.0144	0.0189	0.00235	0.0137
Standard Error	0.00847	0.00609	0.141	0.0076
95% CI	−0.00221 to 0.0310	0.00692 to 0.0308	−0.274 to 0.279	−0.00122 to 0.0286
Z statistic	1.699	3.095	0.0167	1.799
Significance level	0.0892	0.0020	0.9867	0.0720

ROC, receiver operating characteristic; LFFR, local failure-free rate; OS, overall survival; DFFR, distant failure-free rate; DFS, disease-free survival.