Table 4. Comparison of sensitivity, specificity, PPV, NPV with 95% CI, and coefficient κ for detecting viral antigen of 110 FSCs specimens by manner of death, using IHC method (95% CI in parentheses).

Manner of death	Sensitivitya)	Specificity	PPV	NPV	Coefficient κ
Found dead	97.5x (92.3–99.6)	100.0 (96.4–100.0)	100.0 (96.4–100.0)	83.3 (75.1–90.3)	0.9
Euthanasia	96.7x (91.2–99.2)	100.0 (96.4–100.0)	100.0 (96.4–100.0)	75.0 (65.6–82.9)	0.84

a) Values superscripted with the different letters differed significantly in a comparison based on two-tailed z-test (significance set at <0.05) in sensitivity