Skip to main content
. Author manuscript; available in PMC: 2017 Jul 31.
Published in final edited form as: Cornea. 2009 Jun;28(5):503–509. doi: 10.1097/ICO.0b013e3181909362

Table 2. Sensitivity and Specificity of Clinical Findings: Red Eye from 2 Feet, Any Discharge, and a Combination of Red Eye or Any Discharge.

Formulae Red Eye Any Discharge Red Eye or Any Discharge
Sensitivity TP/(TP + FN) 0.96 0.88 1.00
Specificity TN/(TN + FP) 0.35 0.44 0.18
Positive predictive value TP/(TP + FP) 0.52 0.34 0.47
Negative predictive value TN/(TN + FN) 0.92 0.83 1.00
Accuracy (TN + TP)/all 0.61 0.63 0.53

FN, false negative; FP, false positive; TN, true negative; TP, true positive.