Table 3.

Cox proportional hazards regression models in estimating OSCC development

Characteristic	P	Hazard ratio	95% CI
EZH2 expression
Weak**		NA	NA
Moderate	<.0001	.17	.07 to .41
Strong		1.00	--
Histology
Dysplasia	.88	1.08	.36 to 3.26
Other		1.00	--
Alcohol status
No	.17	1.97	.75 to 5.16
Yes		1.00	--

^*The Cox proportional hazards regression model excluded 23 cases that either missed alcohol status or had ‘weak’ as EZH2 expression level.

^**The hazard ratio for the Weak EZH2 expression group was not calculated because all cases in that group were censored.