Table 1. Patient characteristics in each group divided by tumor size.

Tumor Size (mm)		0–50	51–90	≥ 91	Total	P value
Number		390	575	307	1272
Age (years)						< 0.001
	Median	58	56	52	56
	Range	18-89	12-90	14-86	12-90
Gender						0.028
	Male	178	281	171	630
	Female	212	294	136	642
Masaoka Stage						< 0.001
	I	183	190	81	454
	II-III	182	317	162	661
	IV	25	68	64	157
WHO Grade						0.191
	A	35	48	21	104
	AB	69	94	54	217
	B1	43	82	47	172
	B2	72	83	41	196
	B3	62	117	47	357
	Unknown	109	151	97	307
Chemotherapy						< 0.001
	Without	349	444	201	994
	With	41	131	106	278
Radiotherapy						0.002
	Without	201	243	132	576
	Preoperative	5	16	16	37
	Postoperative	184	316	159	659

P value was calculated by chi-square test.