Table 2.

Patient-Based Accuracy of the Prototype Polyp Detection Algorithm Comparing to Optical Colonoscopy Results with the Cut-Off Size of 6 mm

	No contrast data sets			Contrast data sets			All data sets
	Supine	Prone	Both	Supine	Prone	Both	Supine	Prone	Both
True positives	8	9	12	11	11	12	19	20	24
False positives	21	19	27	16	13	21	37	32	48
Total positives	13	13	13	13	13	13	26	26	26
Total negatives	37	37	37	37	37	37	74	74	74
Sensitivity	61.54%	69.23%	92.31%	84.62%	84.62%	92.31%	73.08%	76.92%	92.31%
Specificity	43.24%	48.65%	27.03%	56.76%	64.86%	43.24%	50.00%	56.76%	35.14%