Rectal cancer staging: Multidetector-row computed tomography diagnostic accuracy in assessment of mesorectal fascia invasion

Table 3 Summarizing table of McNemar test calculation to determine the statistical significant of sensitivity and specificity between axial and multiplanar reconstruction computed tomography images in comparison to magnetic resonance imaging

	Axial- subjects	Axial+ subjects	Total of subjects with MRI+
Sensitivity1 (P = 0.22)
MPR- subjects	5	1	6
MPR+ subjects	5	40	45
Total subjects of MRI+	10	41	51n
	AXIAL- subjects	AXIAL+ subjects	Total of subjects with MRI-
Specificity2 (P = 0.13)
MPR- subjects	29	6	35
MPR+ subject	1	4	5
Total of subjects with MRI-	30	10	40n

McNemar test: 2 × 2 contingency table, which tabulates the outcomes of the two tests (axia CT and MPR images) on a sample of n subjects (respectively 51 who were positive with MRI and 40 who were negative).

¹P = 0.22, two tails, not statistically significant;

²P = 0.13, two tails, not statistically significant. CT: Computed tomography; MRI: Magnetic resonance imaging.