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Table 4 Area under the curve (AUC) of receiver operating curve (ROC) characteristic plot analysis.

From: Clinical predictors for Legionella in patients presenting with community-acquired pneumonia to the emergency department

Parameter AUC 95% CI* P-value Optimal cut off Sensitivity Specificity
   Combined Score 0.86 0.81–0.90 - < 2 78.0 78.8
   Temperature 0.74 0.63–0.78 <0.0001 > 39.4 48.1 84.4
   No sputum 0.68 0.61–0.74 <0.0001 - - -
   Sodium 0.71 0.63–0.78 <0.0001 < 133 64.6 70.8
   Lactate dehydrogenase 0.62 0.53–0.71 <0.0001 > 225 67.1 58.1
   C-reactive protein 0.76 0.70–0.82 <0.0001 > 187 71.6 64.7
   Platelet counts 0.71 0.64–0.78 <0.0001 < 171 45.7 83.6
  1. *CI denotes confidence interval;