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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