Table 1.

The characteristics of patients with different ABO blood groups

	O (n=185)	A (n=138)	B (n=136)	AB (n=37)	P-value
Age (years)					0.991
≤ 60	105	76	77	21
> 60	80	62	59	16
Gender					0.700
Female	24	19	23	4
Male	161	119	113	33
Tumor length (cm)					0.936
≤ 3	54	40	37	12
> 3	131	98	99	25
Tumor location					0.946
Upper	7	6	8	2
Middle	93	69	66	21
Lower	85	63	62	14
Differentiation					0.575
Well	29	23	18	3
Moderate	127	88	95	24
Poor	29	27	23	10
Vessel involvement					0.713
Negative	152	117	108	30
Positive	33	21	28	7
T grade					0.629
T1	37	28	21	5
T2	28	25	21	6
T3	98	78	78	22
T4a	22	7	16	4
N staging					0.525
N0	104	86	70	23
N1	47	28	43	8
N2	23	16	11	4
N3	11	8	12	2
Adjuvant therapy					0.887
No	134	100	98	29
Yes	51	38	38	8