The calculation of the sensitivity, specificity, predictive value of a positive test (PV+), predictive value of a negative test (PV-) and the percentage of correct classification (PCC) are shown. The following are the explanations of the abbreviations used:

TP= true positive
FN= false negative
FP= false positive
TN= true negative
SP= screening positive
SN= screening negative
TA= true affected
TH= true healthy (unaffected)
GT= grand total