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Table 3 Results of Gram stain compared with Staphylococcus aureus culture

From: Impact of Gram stain results on initial treatment selection in patients with ventilator-associated pneumonia: a retrospective analysis of two treatment algorithms

  Staphylococcus aureus growth in culturea  
GPC clusters on Gram stain Yes No Total
Yes 50 14 64
No 9 58 67
Total 59 72  
  1. a Sensitivity of Gram stain: 50/59 = 84.7%; specificity of Gram stain: 58/72 = 80.6%; negative predictive value: 58/67 = 86.6%; positive predictive value: 50/64 = 78.1%
  2. GPC Gram-positive cocci