| usually | 19 | degree |
| in onset | 12 | temporal |
| with vertigo | 10 | other |
| symptom → be → sudden | 80 |
| symptom → have → sudden onset | 8 |
| symptom → be → abrupt | 7 |
| symptom → include → sudden | 5 |
| symptom → be of → sudden onset | 3 |
| symptom → appear → sudden | 3 |
| symptom → have → abrupt onset | 3 |
| negative | neutral | positive |
| 0.615 | 0.347 | 0.038 |
| Raw frequency | 109 |
| Normalized frequency | 0.484 |
| Modifier score | 0.754 |
| Perplexity | 74.854 |