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Table 4 Comparison of serum procalcitonin level (at different cut-offs) between any abnormality in CXR and no abnormality

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

  Any abnormality on CXR No CXR abnormality p
PCT level > 0.25 ng/ml
  + ve 79 (37.8) 27 (21.1) 0.001
 -ve 130 (62.2) 101 (78.9)
PCT level > 0.5 ng/ml
  + ve 62 (29.7) 16 (12.5)  < 0.001
 -ve 147 (70.3) 112 (87.5)
PCT level > 1 ng/ml
  + ve 49 (23.4) 11 (8.6) 0.001
 -ve 160 (76.6) 117 (91.4)
PCT level > 2 ng/ml
  + ve 36 (17.2) 9 (7.0) 0.008
 -ve 173 (82.8) 119 (93.0)
PCT level > 3 ng/ml
  + ve 31 (14.8) 8 (6.2) 0.01
 -ve 178 (85.2) 120 (93.8)
  1. Values are in N(%). PCT procalcitonin, CXR chest Xray