Table 1.

Percent observed agreement and Cohen’s Kappa evaluation of the rtPCR method of detection compared to previously reported culture and FAT detection techniques. Reported values were calculated including both positive and negative testing (total of 52 samples).

		Culture	FAT
rtPCR	Percent Observed Agreement	86.5%	51.9%
		(20 + 25)/52	(16 + 11)/52
	Cohen’s Kappa Value	0.73	0.04
		Substantial Agreement	Slight Agreement