The Diagnostic Yield of Colonoscopy Stratified by Indications

Table 2

Colonoscopy findings stratified by previous findings.

	Indication group
	1		2		3		4		5		Total
	Previous	Positive	Previous	Positive	Previous	Positive	Previous	Positive	Previous	Positive	Previous	Positive
No previous colonoscopy	207	56	209	38	0	0	0	0	14	9	430	103
Previous normal colonoscopy	24	2	26	2	0	0	0	0	20	5	70	9
Previous simple polypectomy	12	4	14	2	194	86	0	0	54	18	274	110
Previous advanced polypectomy	0	0	0	0	53	24	0	0	0	0	53	24
Segment bowel resection	7	1	2	0	3	3	251	37	8	2	271	47
Total	250	63	251	42	250	113	251	37	96	34	1098	293

The numerals act as synonyms for the indication groups. 1 = symptoms. 2 = positive screening for CRC cancer. 3 = surveillance after treatment of benign polyp. 4 = surveillance after treatment of colorectal cancer. 5 = surveillance of patients with high risk of developing hereditary colorectal cancer. Previous intervention. This column shows what procedures patients of this indication group previously had. Positive colonoscopy. This column lists the patients with a present positive colonoscopy stratified by previous intervention they have had.