TABLE 2.
Sensitivity, specificity, and positive and negative predictive values of interpretable BBL Crystal MRSA ID tests after 4, 5, and 6 h of incubation
| Organism (no. of isolates) | Incubation time (h) | No. (%) of interpret-able tests | % Agree-ment | Sensi-tivity (%) | Speci-ficity (%) | PPVa (%) | NPVb (%) |
|---|---|---|---|---|---|---|---|
| S. aureus (59) | 4 | 54 (91.5) | 85.2 | 60.0 | 100 | 100 | 81.0 |
| 5 | 58 (98.3) | 91.4 | 79.2 | 100 | 100 | 87.2 | |
| 6 | 59 (100) | 93.2 | 84.0 | 100 | 100 | 89.5 | |
| CNS (92) | 4 | 60 (65.2) | 61.7 | 37.8 | 100 | 100 | 50.0 |
| 5 | 83 (90.2) | 69.9 | 47.8 | 100 | 100 | 58.3 | |
| 6 | 89 (96.7) | 73.0 | 53.8 | 100 | 100 | 60.7 |
a
PPV, positive predictive value.
b
NPV, negative predictive value.