Table 4.

Multivariate Analysis of Regional control, distant control, DFS, DSS and OS

Variable	Regional Control	Distant Control	DFS	DSS	OS
Lymph Node Yield
Per node examined	P = 0.0003	P = 0.028	P = 0.003	P = 0.003	P = 0.014
	RR = 0.95	RR = 0.97	RR = 0.97	RR = 0.97	RR = 0.98
	CI, 0.93–0.98	CI, 0.94–1.0	CI, 0.94–0.99	CI, 0.94–0.99	CI, 0.97–1.0
Neck Dissection
		P = 0.09
SND vs. MRND		RR = 2.63
		CI, 0.88–11.3
T-stage	P = 0.048
	RR = 2.1
T4 vs. T3	CI, 0.84–4.40
Positive margins	P = 0.09		P = 0.1
	RR = 2.3		RR = 2.1
	CI, 0.85–5.2		CI, 0.8–4.4
Age					P = 0.075
					RR = 1.14
Per decade of age					CI, 0.75–1.4

SND = Selective neck dissection; MRND = Modified radical neck dissection