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