. 2018 May 9;16(1):308–316. doi: 10.3892/ol.2018.8676

Table II.

Univariate analysis of the association between various cervical lymph node variables and patient prognosis.

Variables	OS	χ²	P-value	DFS	χ²	P-value	RFS	χ²	P-value	DMFS	χ²	P-value
Level		30.003	<0.001		22.774	0.001		1.170	0.978		31.184	<0.001
Level IB	–			–			–			–
Level II	82.7			81.9			94.4			87.7
Level III	75.2			73.6			93.3			79.9
Level IVa	67.0			65.6			93.3			71.9
Level Va	92.3			65.9			91.7			74.0
Level Vb	37.0			44.4			100			44.4
Level (IVb+Vc)	33.3			33.3			100			33.3
Level VIIa	78.9			86.5			91.7			85.9
Group		12.109	0.001		10.682	0.001		0.062	0.803		13.792	<0.001
Level 1	79.8			78.0			93.6			83.9
Level 2	39.2			59.1			95.0			63.6
D_max, cm		14.566	0.001		15.728	<0.001		0.575	0.750		14.068	0.001
≤3	81.0			77.3			93.6			83.3
>3 and ≥6	78.1			76.4			94.8			81.3
>6	45.5			36.4			90.9			45.5
Laterality		12.640	<0.001		11.866	0.001		4.645	0.031		6.682	0.010
Unilateral	89.2			86.3			97.6			88.5
Bilateral	71.2			70.3			92.0			77.7
RLN		17.872	0.046		14.199	<0.001		4.710	0.030		8.970	0.003
No	96.2			91.9			98.9			93.0
Yes	73.3			71.9			92.3			78.9
Extracapsular spread		6.071	0.014		1.700	0.192		0.001	0.976		1.921	0.166
No	86.0			79.4			93.7			85.4
Yes	73.8			74.5			93.9			80.2
Necrosis		0.426	0.514		1.754	0.185		2.636	0.104		0.315	0.574
No	78.2			77.2			94.7			82.2
Yes	72.7			70.2			89.0			80.2

OS, overall survival; DFS, disease-free survival; RFS, relapse-free survival; DMFS, distant metastasis-free survival; D_max, maximum diameter; RLN, retropharyngeal lymph nodes.