Table 3.

Multivariate Cox analysis for overall survival of oral cancer patients

Variable	Model 1		Model 2		Model 3		Model 4		Model 5		Model 6
	HR (95%CI)	P	HR (95%CI)	P	HR (95%CI)	P	HR (95%CI)	P	HR (95%CI)		HR (95%CI)
BMI (kg/m2)
18.5–23.9	1.000								1.000		1.000
< 18.5	1.585 (1.207,2.082)	0.001							1.530 (1.163,2.013)	0.002	1.546 (1.174,2.034)	0.002
≥ 24.0	0.942 (0.711,1.247)	0.675							0.972 (0.733,1.289)	0.844	0.953 (0.720,1.262)	0.737
ALB (g/l)
< 40.0			1.000						1.000
≥ 40.0			0.716 (0.575,0.891)	0.003					0.745 (0.597,0.930)	0.009
PNI
< 49.3					1.000						1.000
≥ 49.3					0.793 (0.633,0.992)	0.043					0.828 (0.659,1.039)	0.104
NRI
< 97.5							1.000
≥ 95.5							0.588 (0.469,0.738)	< 0.001
AIC	4346.569		4347.161		4351.984		4335.862		4341.773		4345.895
C-index	0.725		0.727		0.721		0.733		0.732		0.727
Somers’ D	0.450		0.454		0.441		0.465		0.464		0.453
LR χ2	248.820		246.230		241.410		257.530		255.620		251.490

Note: all adjustment for age, gender, occupation, education level, residence, clinical classification, pathological grading, surgery therapy, adjuvant therapy and recruitment time; LR χ²: Likelihood Ratio χ²