Sensitivity and specificity of the self-administered questionnaire (Analysis in terms of patients)
| Reported by the patient | Reported by the neurologist | ||
| At least one relevant prior symptom | No relevant prior symptom | Total | |
| At least one prior symptom | 55 | 24 | 79 |
| No prior symptom | 4 | 95 | 99 |
| Total | 59 | 119 | 178 |
| PPV | 69.6% | (59.5%; 79.8%) |
| NPV | 96.0% | (92.1%; 99.8%) |
| Sensitivity | 93.2% | (86.8%; 99.6%) |
| Specificity | 79.8% | (72.6%; 87.0%) |
| Percentage of false positives | 30.4% | |
| Percentage of false negatives | 4.0% |
PPV, Positive predictive value; NPV, Negative predictive value.