Bacterial Cut-off (µl) Sensitivity or True Positive(TP) Specificity or True Negative(TN) False Negative(FN) = 1-Sensitivity False Positive(FP) = 1-Specificity PPV NPV Reduction of Cultures -1.0 1.000 0.000 0.000 1.000 0.500 1.000 0.000 10.5 0.971 0.462 0.029 0.538 0.643 0.941 0.245 25.0 0.962 0.677 0.038 0.323 0.749 0.946 0.358 55.0 0.942 0.723 0.058 0.277 0.773 0.926 0.390 85.0 0.913 0.762 0.087 0.238 0.793 0.898 0.424 103.0 0.885 0.792 0.115 0.208 0.810 0.873 0.454 213.0 0.808 0.854 0.192 0.146 0.847 0.816 0.523 301.5 0.769 0.885 0.231 0.115 0.870 0.793 0.558 400.0 0.702 0.923 0.298 0.077 0.901 0.756 0.611 528.0 0.654 0.931 0.346 0.069 0.904 0.729 0.638 737.0 0.625 0.946 0.375 0.054 0.921 0.716 0.661 1019.0 0.587 0.977 0.413 0.023 0.962 0.703 0.695 1461.0 0.519 0.992 0.481 0.008 0.985 0.674 0.737 2139.0 0.481 1.000 0.519 0.000 1.000 0.658 0.760

Table 3: Summary of Sensitivity, Specificity, Negative Predictive Value, Positive Predictive Value and Reduction of Cultures of UF-1000i according to bacterial count cut-off values in 234 specimens