Table 2.

Image features and classification scores of endoluminal cases on computed tomographic colonography

Class	Case number	Rated feature	SR	GM	p-valuea
Potential malignancy	16	Spatial shape	2	2.56	<0.01
			2	2.94
		Gray-level pattern	1	2.06	<0.01
			1	2
		2D correlation classification	2	2.75	<0.01
			2	2.94
Other benignity	17	Spatial shape	2	2.41	<0.01
			2	2.88
		Gray-level pattern	1	2	<0.01
			1	2
		2D correlation classification	1.88	2.59	<0.01
			1.88	2.76

2D, two-dimensional; GM, gray level mapping; SR, surface rendering.

Potential malignancy: polyps or tumours. Other benignity: stool, fluid, faeces, ileocaecal valves, intraluminal calcification.

The upper subrows and the lower subrows of every rated feature represent the average score scored by two different radiologists, respectively.

^aWilcoxon signed-rank test (one-tailed).