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Table 3 Sensitivity, Specificity, Predictive value, Likelihood ratio of Procalcitonin (> 0.5 ng/mL) for different diagnostic criteria of pneumonia

From: Role of procalcitonin in diagnosis of community acquired pneumonia in Children

  Sensitivity Specificity Likelihood ratio positive Likelihood ratio negative Positive predictive value Negative predictive value
Pneumonia as per any CXR abnormalities 29.7 (23.6, 36.4) 87.5 (80.5, 92.7) 2.4 (1.4, 3.9) 0.8 (0.7, 0.9) 79.5 (70.1, 86.5) 43.2 (40.6, 45.9)
Pneumonia as per presence of consolidation on CXR 34.5 (22.5, 48.1) 79.2 (73.9, 83.8) 1.7 (1.1, 2.5) 0.8 (0.7, 1.01) 25.6 (18.4, 34.5) 85.3 (82.7, 87.6)
Pneumonia as per WHO criteria 23.4(18.8, 28.5) 82.8 (70.6, 91.4) 1.4 (0.7, 2.5, 7.8) 0.9 (0.8, 1.1) 87.9 (80.5, 93) 16.7 (14.9, 18.6)
  1. PCT + ve: Cut-off for positive serum procalcitonin level has been considered at > 0.5 ng/mL, (Values are in % with 95% CI) except likelihood ratios