Table 3.

Specificity and 95% Wilson’s confidence intervals of the P22 ELISA for detecting antibodies against the Mycobacterium tuberculosis complex at two cut-off points in different host species from Norway (A) and Spain (B)

		Cut-off 100%		Cut-off 150%
Species	N° of animals	Na	Spb	Na	Spb
A)
Cattle	500	20*	96 (93.9–97.4)	3	99.4 (98.3–99.8)
Goat	100	22*	78 (68.9–85)	3*	97 (91.6–99)
Sheep	100	4	96 (90.2–98.4)	0	100 (96.3–100)
Pig	100	0	100 (96.3–100)	0	100 (96.3–100)
Total	800
B)
Cattle	1014	76*	92.50 (90.7–94)	20	98 (97–98.7)
Goat	123	85*	30.9 (23.4–39.5)	54*	56.1 (47.3–64.6)
Sheep	394	22	94.4 (91.7–96.3)	7	98.23 (96.4–99.1)
Pig	100	0	100 (86.2–100)	0	100 (86.2–100)
Total	1631

^aNumber of positive animals

^b95% Confidence interval for specificity

^*Significant difference (p < 0.05) in the proportion of negative animals of each species between Norway and Spain