| usually | 19 | degree |
| in onset | 14 | temporal |
| depending on the cause | 5 | other |
| symptom → be → gradual | 43 |
| symptom → have → gradual onset | 10 |
| symptom → be of → gradual onset | 4 |
| symptom → appear → gradual | 3 |
| negative | neutral | positive |
| 0.470 | 0.481 | 0.049 |
| Raw frequency | 60 |
| Normalized frequency | 0.404 |
| Modifier score | 0.783 |
| Perplexity | 197.475 |