Table 4: Formula for calculating the diagnostic power of the two subjective tests, respectively, as compared with the diagnosis based on ECochG measures.

ECochG diagnosis
(hypothetical “gold standard”)

PositiveNegative
Results from AAO-HNS CHE (or Gibson score)Positivea
(true positive)
b
(false positive)
Negativec
(false negative)
d
(true negative)

Sensitivity = a/(a+c).
Specificity = d/(b+d).
Positive predictive value = a/(a+b).
Negative predictive value = d/(c+d).