Table 5.

Association between PET parameter and distant metastasis-free survival rates adjusted for N stage by multivariate Cox proportional hazard model

Factors	Hazard ratio	95% CI	p-value	C index
Model 1: T–SUVmax
N stage
N1 vs N2	4.156	0.893–19.352	0.069
N1 vs N3b	2.894	0.479–17.474	0.247
T−SUVmax (≤8.0 vs >)	4.169	1.123–15.476	0.033a	0.763
Model 2: T–SUVmean
N stage
N1 vs N2	4.215	0.908–19.576	0.066
N1 vs N3b	2.844	0.471–17.164	0.255
T–SUVmean (≤3.2 vs >)	4.385	0.969–19.849	0.055	0.746
Model 3: T–SUVpeak
N stage
N1 vs N2	4.559	0.986–21.083	0.052
N1 vs N3b	3.558	0.473–26.771	0.218
T–SUVpeak (≤10.2 vs >)	3.973	1.215–12.991	0.022a	0.769
Model 4: N–SUVmax
N stage
N1 vs N2	4.323	0.916–20.389	0.064
N1 vs N3b	2.697	0.437–16.640	0.285
N–SUVmax (≤10.6 vs >)	2.860	0.994–8.228	0.051	0.725
Model 5: N–SUVpeak
N stage
N1 vs N2	4.415	0.903–21.573	0.067
N1 vs N3b	2.008	0.273–14.786	0.493
N–SUVpeak (≤7.7 vs >)	2.222	0.714–6.914	0.168	0.715
Model 6: N(f)–SUVmax
N stage
N1 vs N2	4.490	0.965–20.896	0.056
N1 vs N3b	1.742	0.274–11.084	0.557
N(f)–SUVmax (≤10.6 vs >)	6.524	2.228–19.108	0.001a	0.756
Model 7: N(f)–SUVpeak
N stage
N1 vs N2	4.662	1.013–21.466	0.048a
N1 vs N3b	2.206	0.364–13.371	0.389
N(f)–SUVpeak (≤8.5 vs >)	5.399	1.935–15.068	0.001a	0.745

CI, confidence interval; SUV_max, maximum standardized uptake value; SUV_mean, mean standardized uptake value; SUV_peak, peak standardized uptake value.

^ap-value <0.05.