Diagnostic test statistics – Skin test.

Diagnostic test statistics were calculated for each test method. Sensitivity (Se) is the likelihood to detect the presence of disease [Total Positive (TP)/TP + False Negative (FN)]. Specificity (Sp) is the likelihood to detect absence of disease [(Total Negative (TN)/TN + False Positive (FP)]. PPD served as an antigen control. Statistics for detecting tuberculosis: Sensitivity is (36/40) 90%, specificity is (41/100) 41%.