| STAGE | n | Accuracy (%) | Sensibility (%) | Specificity (%) |
| I | 5 | 86.7 | 60 | 100 |
| II | 4 | 86.7 | 75 | 90.9 |
| III | 3 | 86.7 | 100 | 83.3 |
| IV | 3 | 100 | 100 | 100 |