Analysis of 234 cases of colorectal polyps treated by endoscopic mucosal resection

Table 1 Comparison of clinical characteristics and endoscopic features

Item	Yamada type				Total
	I	II	III	IV
Number of polyps, examples	4	75	101	115	295
Sex
Male	4	57	61	97	219
Female	0	18	40	18	76
Age
< 60	0	31	50	61	149
≥ 60	4	44	51	54	146
Polyp size in cm
0.5-0.9	1	55	58	31	145
≥ 1	3	20	43	84	150
Surface morphology of polyps, examples
Bloody and red	0	29	45	83	157
Smooth	3	36	31	22	92
Rough and unkempt	1	26	46	41	114
Lobular	0	10	22	45	77
Dissipated	1	5	3	11	20
Polyp site, examples
Left hemicolon, including rectum	0	46	58	67	171
Right hemicolon, including ileocecum	4	29	43	48	124

Table 2 Comparison of general clinical conditions of each group

Group	Sex		Age		Size of the polyp in cm		Site of the polyp in cm
	Female	Male	< 60	≥ 60	0.5-0.9	≥ 1	Left colon, including the rectum	Right colon, including the ileocecal region
Non-adenoma	28	13	20	21	28	13	21	20
Low-risk adenoma	81	29	52	58	105	5	58	52
High-risk adenoma	106	33	64	75	11	128	89	50
Carcinogenesis	4	1	1	4	0	5	3	2
χ2 value	1.162		1.535		199.825		5.416
P value	0.762		0.674		0		0.144

Table 3 Comparison of morphological characteristics of each group under endoscopy

Groups	Polyp pattern					Yamada type
	Bloody, red	Smooth	Coarse, not smooth	Leaflets	Eroded	I	II	III	IV
Non-adenoma	15	25	8	5	4	2	12	14	13
Low-risk adenoma	53	44	53	11	5	0	43	39	28
High-risk adenoma	88	23	52	59	10	1	19	48	71
Carcinogenesis	0	0	5	2	1	1	1	0	3
χ2 value	75.257					47.676
P value	0					0