Table 3: Specificities, sensitivities, percentage of correctly classified patients, and the likelihood ratios of the markers correlating significantly with infectious colon perforation.

MarkerSensitivitySpecificityCorrectly classifiedLikelihood ratio +Likelihood ratio −

Fever (>37.5°C)28%87%66%2.20.8
Tachycardia (>100 bpm)21%91%65%2.40.9
Hyponatremia (<136 mmol/L)31%79%61%1.50.9
Markedly elevated CRP (>50 mg/L)80%40%54%1.30.5
Leukocytosis (>10/nL)74%39%51%1.20.7