Table 6

Characterisation of polyps retrieved, by histological determination

	Adenoma*		Hyperplastic*		Other/not determined*		Total
	N=1014	Per cent	N=400	Per cent	N=206	Per cent	N=1620	Per cent
Polyp size
Diminutive (≤5 mm)	706	69.6	315	78.8	173	84.0	1194	73.7
Polyp site
Ascending colon	188	18.5	19	4.8	24	11.7	231	14.3
Caecum	119	11.7	18	4.5	34	16.5	171	10.6
Descending colon	99	9.8	22	5.5	21	10.2	142	8.8
Distal transverse colon	97	9.6	20	5.0	17	8.3	134	8.3
Hepatic flexure	73	7.2	19	4.8	12	5.8	104	6.4
Proximal transverse colon	71	7.0	15	3.8	6	2.9	92	5.7
Rectum	94	9.3	146	36.5	38	18.4	278	17.2
Sigmoid	204	20.1	130	32.5	41	19.9	375	23.1
Sigmoid descending	8	0.8	4	1.0	2	1.0	14	0.9
Splenic flexure	61	6.0	5	1.3	8	3.9	74	4.6
Not recorded	0	0.0	2	0.5	3	1.5	5	0.3
Polyp shape
Ip	40	3.9	9	2.3	4	1.9	53	3.3
Ips	117	11.5	27	6.8	12	5.8	156	9.6
Is	478	47.1	208	52.0	101	49.0	787	48.6
IIa	349	34.4	149	37.3	83	40.3	581	35.9
IIa/c	2	0.2	0	0.0	0	0.0	2	0.1
IIb	20	2.0	3	0.8	5	2.4	28	1.7
Not recorded	8	0.8	4	1.0	1	0.5	13	0.8
Polyp resection
Cold biopsy	171	16.9	168	42.0	69	33.5	408	25.2
Cold snare	540	53.3	146	36.5	89	43.2	775	47.8
Endoscopic mucosal resection	44	4.3	13	3.3	5	2.4	62	3.8
Hot biopsy	22	2.2	15	3.8	1	0.5	38	2.3
Hot snare	232	22.9	58	14.5	25	12.1	315	19.4
Not recorded	5	0.5	0	0.0	17	8.2	22	1.4
Confidence in optical diagnosis
High confidence	769	75.8	340	85.0	157	76.2	1266	78.1
NICE classification
Vessels: T	661	65.2	67	16.8	72	35.0	882	54.4
Surface pattern: O	696	68.6	85	21.3	76	36.9	800	49.4
Colour: B	726	71.6	82	20.5	74	35.9	857	52.9
None of the above	202	20.4	285	72.3	101	51.8	588	37.2
One of the above	92	9.3	40	10.2	23	11.8	155	9.8
Two of the above	101	10.2	13	3.3	14	7.2	128	8.1
Three of the above	595	60.1	56	14.2	57	29.2	708	44.8

*Data shown give proportions within groups and are unadjusted for hierarchy at the patient level.
NBI, narrow band imaging; NICE, NBI International Colorectal Endoscopic.