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Table 1 Sensitivity, specificity, positive predictive value, and negative predictive value of the COS system, in which diagnosis was based on a positive culture.

From: "Cough officer screening" improves detection of pulmonary tuberculosis in hospital in-patients

 

Sensitivity (= TP/(TP + FN))

Specificity (= TN/(FP + TN))

PPV (= TP/(TP + FP))

NPV (= TN/(TN + FN))

Stage I

92.38%

80.84%

0.98%

99.98%

Stage II

85.62%

85.78%

1.10%

99.97%

  1. TP: true positive; FN: false negative; TN: true negative; FP: false positive; PPV: Positive predictive value; NPV: Negative predictive value.