| to several hours | 21 | temporal |
| from four to seven days | 19 | temporal |
| several weeks | 16 | temporal |
| symptom → can → last | 159 |
| symptom → be → lasting | 38 |
| symptom → last for → some | 12 |
| symptom → last for → some people | 12 |
| symptom → last on → rare occasions | 6 |
| symptom → could → last | 4 |
| symptom → last for → sometimes | 3 |
| negative | neutral | positive |
| 0.477 | 0.469 | 0.054 |
| Raw frequency | 234 |
| Normalized frequency | 0.587 |
| Modifier score | 0.520 |
| Perplexity | 78.602 |