Table 2.

Univariate analysis for predictors of local recurrence.

Covariate	3 year cumulative incidence of LR	5 year cumulative incidence of LR	p-value
Age:
<=50	7	9
>50	15	17	<0.001
Sex:
Male	11	12
Female	11	14	0.61
Site:
Lower	11	13
Upper	8	13	0.65
Size
<=5cm	8	10
>5cm	13	16	0.017
Depth:
Superficial	10	12
Deep	11	13	0.34
Histology:
Others	13	15
WDL/ALT	2	6	0.003
Grade:
Low	6	8
High	16	19	<0.001
Margin:
Negative	8	10
Positive/close	17	22	<0.001