Table 2.
Members identified in each class
| Measured values | S aureus (n = 43) | S epidermidis (n = 18) | P aeruginosa (n = 40) |
|---|---|---|---|
| Adherent bacteria (colony forming units/cm2) | 5 × 103 ± 3 × 103 | 5.8 × 104 ± 3.9 × 104 | 1.66 × 105 ± 1.03 × 105 |
| Raw spectra | |||
| Discs identified | 37 | 16 | 28 |
| Sensitivity | 97% (88%–99%) | 100% (95%–100%) | 77% (65%–86%) |
| Specificity | 86% (73%–93%) | 89% (67%–97%) | 70% (55%–82%) |
| First derivative | |||
| Discs identified | 36 | 16 | 25 |
| Sensitivity | 100% (93%–100%) | 83% (74%–90%) | 100% (94%–100%) |
| Specificity | 84% (68%–92%) | 89% (67%–97%) | 63% (47%–78%) |
| Single normal variant | |||
| Discs identified | 38 | 15 | 29 |
| Sensitivity | 93% (84%–97%) | 95% (88%–98%) | 93% (83%–98%) |
| Specificity | 88% (75%–95%) | 83% (60%–94%) | 73% (57%–85%) |
| Single normal variant + first derivative | |||
| Discs identified | 32 | 17 | 26 |
| Sensitivity | 100% (93%–100%) | 100% (95%–100%) | 100% (94%–100%) |
| Specificity | 74% (60%–85%) | 94% (74%–99%) | 65% (50%–78%) |