Table 2. Chi square test of single factors.

Variable	Non Recurrence	Recurrence	λ2 Value	P Value
Age
≤ 67	65	149	0.002	1.000
> 67	64	148
Gender
Male	104	239	0.001	1.000
Female	25	58
Grade
Low	55	94	4.773	0.035
High	74	203
Number
Single	102	198	6.642	0.011
Multiple	27	99
Size
< 3 cm	96	191	4.181	0.043
≥ 3 cm	33	106
Squamous
No	76	137	5.882	0.020
Yes	53	160