Table 4. Spearman correlation coefficients (r) between TLG and SCC-ag, NLR, PLR and Hb based on different %SUV_max thresholds (from 30% to 60% of SUV_max).

TLG	P30%	C30%	P35%	C35%	P40%	C40%	P45%	C45%	P50%	C50%	P55%	C55%	P60%	C60%
SCC-ag
r	0.322*	0.395*	0.323*	0.392*	0.306*	0.387*	0.323*	0.402*	0.353*	0.409*	0.342*	0.418*	0.315*	0.383*
P	0.002*	<0.001*	0.002*	<0.001*	0.004*	<0.001*	0.002*	<0.001*	0.001*	<0.001*	0.001*	<0.001*	0.003*	<0.001*
Hb
r	−0.025	0.006	−0.052	−0.042	−0.033	−0.040	−0.050	−0.061	−0.042	−0.066	−0.014	−0.026	−0.011	−0.025
P	0.816	0.953	0.631	0.695	0.757	0.711	0.645	0.569	0.695	0.537	0.900	0.806	0.920	0.814
NLR
r	0.256*	0.295*	0.271*	0.325*	0.243*	0.286*	0.303*	0.344*	0.334*	0.411*	0.270*	0.341*	0.237*	0.274*
P	0.015*	0.005*	0.010*	0.002*	0.022*	0.007*	0.004*	0.001*	0.001*	<0.001*	0.01*	0.001*	0.025*	0.009*
PLR
r	0.175	0.204	0.172	0.232*	0.170	0.226*	0.233*	0.281*	0.250*	0.352*	0.230*	0.324*	0.201	0.285*
P	0.101	0.055	0.107	0.029*	0.111	0.033*	0.028*	0.008*	0.018*	0.001*	0.030*	0.002*	0.059	0.007*

*, significant correlation. SUV_max, maximum standardized uptake value; TLG, total lesion glycolysis; SCC-ag, squamous cell carcinoma antigen; NLR, neutrophil-lymphocyte ratio; PLR, platelet-lymphocyte ratio; Hb, hemoglobin; %SUV_max, percentage of SUV_max; SMLNs, suspicious metastatic lymph nodes; P_n%, TLG of the primary tumor estimated by using the n%SUV_max threshold; C_n%, TLG of the combination of the primary tumor and SMLNs estimated by using the n%SUV_max threshold.