Diagnostic Accuracy of NICE Classification System for Optical Recognition of Predictive Morphology of Colorectal Polyps

Table 4

Confusion matrix distribution of the NICE classifications performed by physicians (predicted) over the NICE classifications obtained from histopathology (reference).

		Reference (obtained from histopathology)
		NICE 1	NICE 2	NICE 3	Normal	Other	∑
Predicted	NICE 1	38 (36.5%)	55 (52.9%)	0 (0.0%)	10 (9.6%)	1 (1%)	104 (100%)
	NICE 2	70 (11.4%)	516 (84.3%)	8 (1.3%)	10 (1.6%)	8 (1.3%)	612 (100%)
	NICE 3	0 (0.0%)	11 (57.9%)	8 (42.1%)	0 (0.0%)	0 (0.0%)	19 (100%)
	∑	108	582	16	20	9	735

Percentages shown within brackets represent shares of polyps classified by physicians (predicted) among the reference classes. Alternatively, the shares of polyps in percentages can be expressed for the reference classes over the predicted ones (see Discussion).