Sensitivity Specificity Positive predictive value Negative predictive value
PCT, ng/mL        
<0.1 86.2 78.9 67.6 91.8
<0.25 93.1 59.6 54.0 94.4
<0.5 93.1 50.9 49.1 93.5
<1.0 100.0 31.6 42.6 100.0
Table 2: Diagnostic validity of procalcitonin (PCT) in differentiating pulmonary tuberculosis from bacterial acquired pneumonia according to the different value