Multivariate hazard ratios, confidence intervals, and P values.

Table 3: Multivariate hazard ratios, confidence intervals, and P values.

	Hazard Ratio
	N	Estimate	95% CI	P value
Age at diagnosis
< 40^* 40-59 60-79 80+	242 687 543 123	Reference 1.74 3.61 9.46	1.28-2.37 3.18-4.10 9.12-9.81	< 0.001 < 0.001 < 0.001
Race
White^* Black Asian/Pacific Islanders Other/Unknown	1229 153 189 24	Reference 1.06 1.19 2.43	0.80-1.39 0.92-1.54 1.24-4.76	0.702 0.182 0.009
Gender
Female^* Male	952 643	Reference 1.41	1.20-1.66	< 0.001
Received Radiation
Yes^* No Unknown	1116 454 25	Reference 0.86 0.73	0.72-1.04 0.34-1.57	0.120 0.421
Surgery Type
Gross^* Partial None Other/Unknown	383 148 62 1002	Reference 0.91 1.43 0.96	0.85-0.98 1.27-1.61 0.79-1.17	0.010 < 0.001 0.700
Lymph Node Involvement
Yes^* No Unknown	392 1194 9	Reference 0.62 2.21	0.52-0.73 1.00-4.88	< 0.001 0.049
Tumor Size (mms in largest dimension)
< 21^* 21-40 > 40 Unknown	599 586 181 229	Reference 1.69 2.98 1.56	1.66-1.72 2.31-3.85 1.52-1.6	< 0.001 < 0.001 < 0.001
Tumor Site
Major Salivary Glands Palate^* Unspecified Mouth Parts Tongue Mouth Floor Nasopharynx Lip Other	935 266 111 108 43 53 49 30	Reference 0.99 1.09 1.29 1.04 1.90 1.00 0.94	0.97-1.00 1.03-1.15 1.24-1.35 0.92-1.18 1.75-2.07 0.88-1.14 0.51-1.75	0.040 < 0.001 < 0.001 0.530 < 0.001 0.940 0.860

^*Reference group against which other groups' survival experience are compared; ^*^*P value for test if groups' survival experience is same as reference group.