TABLE 3.
Performance parameters of BacT/ALERT 3D system and PZase assay after resolution of the discordant results
| Performance parameter | % witha:
|
|
|---|---|---|
| BacT/ALERT 3D system | PZase assay | |
| Sensitivity | 100 (35/35) | 82.85 (29/35) |
| Specificity | 98.61 (71/72) | 95.83 (69/72) |
| Accuracy | 99.06 (106/107) | 91.58 (98/107) |
| Predictive value for resistance (PPV)b | 97.22 (35/36) | 90.63 (29/32) |
| Predictive value for susceptibility (NPV)c | 100 (71/71) | 92.0 (69/75) |
a
Values in parentheses are the number of isolates; the first number represents the number of isolates detected for each parameter, and the second number represents the total number of isolates tested.
b
PPV, positive predictive value.
c
NPV, negative predictive value.