Table 3.

Univariate analyses for overall survival in the training set (n=50) and in the validation set (n=95)

Variable	HR	95% CI	P values
Univariate analysis (Cox regression) in the training set (n=50)
ECOG PS 1 vs 0	1.230	0.605 to 6.012	0.345
T4 vs T1-T3	1.9123	0.616 to 5.945	0.262
N2b-N3 vs N0-N2a	1.166	0.373 to 3.648	0.792
NLR ≥2.6 vs <2.6	2.829	0.90 to 8.80	0.73
dNLR ≥1.7 vs <1.7	3.539	1.129 to 11.038	0.03
PNI <45 vs ≥45	2.845	1.04 to 7.783	0.042
Univariate analysis (Cox regression) in the validation set (n=95)
Variable	HR	95% CI	P values
ECOG PS 1 vs 0	1.148	0.629 to 5.980	0.280
T4 vs T1-T3	2.360	1.022 to 5.448	0.044
N2b-N3 vs N0-N2a	2.388	1.115 to 5.117	0.025
NLR ≥2.6 vs <2.6	1.232	0.633 to 2.40	0.539
dNLR ≥1.7 vs <1.7	1.487	0.762 to 2.902	0.245
PNI <45 vs ≥45	3.749	1.764 to 7.969	0.001

NLR, neutrophil to lymphocyte ratio; PNI, Prognostic Nutritional Index; PS, Eastern Cooperative Oncology Group Performance Status; dNLR, derived neutrophil to lymphocyte ratio.