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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 |