Table 4. Contingency table for DID dye.

frequencies observed		reality (microscopic analysis)
		transplanted cells present (+)	transplanted cells absent (-)	sum
diagnostic test (IVIS analysis)	positive result (+)	36	1	37
	negative result (-)	9	8	17
	sum	45	9	54

Microscopic examination was assumed as a reference method. Method using IVIS® constituted a diagnostic test. The comparison of the microscopic analysis and data from IVIS® imaging with manual setting ranges. This analysis did not distinguished number of spots within an urethra slice and only the presence/absence of transplanted cells in the particular slice registered by microscopy or IVIS®.