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Table 2 Association between serum procalcitonin (PCT) concentrations and pneumonia as per CXR pathologyand existing WHO classification in 370 children in whom PCT levels are available

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

Any abnormality on chest X-ray
  Abnormality present on CXR No abnormality on CXR Total
PCT + ve 62 (29.7) 16 (12.5) 78
PCT –ve 147 (70.3) 112 (87.5) 259
Total 209 (100) 128 (100) N = 337
P < 0.001
Consolidation on chest X-ray
  Consolidation present Consolidation absent Total
PCT + ve 20 (34.5) 58 (20.8) 78
PCT –ve 38 (65.5) 221 (79.2) 259
Total 58 (100) 279 (100) N = 337
P = 0.02
Pneumonia as per WHO criteria
  WHO pneumonia No pneumonia Total
PCT + ve 73 (23.4) 10 (17.2) 83
PCT –ve 239 (76.6) 48 (82.8) 287
Total 312 (100) 58 (100) N = 370
P = 0.30
  1. PCT + ve: Children with serum PCT concentrations > 0.5 ng/mL;CXR: Chest X-ray, only 337 CXRs were available as not all children without pneumonia underwent CXR
  2. All values are expressed as n (%)