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Table 3 Qualitative and quantitative analysis

From: Ventilator associated pneumonia: comparison between quantitative and qualitative cultures of tracheal aspirates

Parameter Qualitative Quantitative
   105 cfu/ml 106 cfu/ml
Sensitivity 81% 65% 26%
Specificity 23% 48% 78%
Positive predictive value 18% 21% 20%
Negative predictive value 86% 87% 83%
Likelihood ratio of positive test 1.05 1.25 1.18
Likelihood ratio of negative test 0.83 0.73 0.95
  1. cfu, colony-forming units.