Table 3. Sensitivity (Se), specificity (Sp), positive predictive value (PPV), negative predictive value (NPV), and classification accuracy (A) of the device and the surgeon.
| Samples (n) | Se (%) | Sp (%) | PPV (%) | NPV (%) | A (%) |
| Device Performance | |||||
| All (88) | 74 | 86 | 85 | 75 | 80 |
| MBD 1–2 (48) | 65 | 92 | 88 | 74 | 79 |
| MBD 3–4 (40) | 83 | 76 | 83 | 76 | 80 |
| Anterior & Posterior (40) | 64 | 73 | 80 | 55 | 68 |
| Other orientation (48) | 86 | 93 | 90 | 89 | 90 |
| Surgeon Performance* | |||||
| All (88) | 65 | 21 | |||
| MBD 1–2 (48) | 70 | 28 | |||
| MBD 3–4 (40) | 61 | 12 | |||
| Anterior & Posterior (40) | 48 | 33 | |||
| Other orientation (48) | 86 | 15 |
Performance within each MBD subgroup is given. *The surgeon’s performance is based on the primary specimen (and no additional shavings) taken during the first operation.