TABLE 4.
Sensitivities, specificities, PPVs, and NPVs of the three media tested on 528 clinical specimens
| Samples considered and medium | No. of samples |
% Sensitivity (95% CI) | % Specificity (95% CI) | % PPV (95% CI) | % NPV (95% CI) | ||
|---|---|---|---|---|---|---|---|
| TPa | FPb | FNd | |||||
| All samples | |||||||
| MCC | 44 | 24 | 15 | 74.6 (68.9-80.2) | 96.8 (96.0-97.6) | 64.7 (58.9-70.5) | 96.8 (96.0-97.6) |
| BM | 56 | 59 | 3 | 94.9 (92.1-97.8) | 94.9 (93.9-95.9) | 48.7 (44.0-53.4) | 99.3 (98.9-99.7) |
| OX | 56 | 64 | 3 | 94.9 (92.1-97.8) | 95.1 (94.1-96.1) | 46.7 (42.1-51.2) | 99.3 (98.9-99.7) |
| Selected samplesc | |||||||
| BM | 51 | 21 | 8 | 86.4 (82.0-90.9) | 95.5 (94.6-96.5) | 70.8 (65.5-76.2) | 98.2 (97.6-98.9) |
| OX | 56 | 20 | 3 | 94.9 (92.1-97.8) | 95.7 (94.8-96.7) | 73.7 (68.6-78.7) | 99.3 (99.0-99.7) |
a
TP, true positive. A result was considered TP when at least one ESBL-positive isolate was recovered from the sample.
b
FP, false positive. A result was considered FP when the isolate(s) recovered was not confirmed to be an ESBL producer.
c
When selection criteria (oxidase-negative and colored colonies) were applied.
d
FN, false negative.