| gradually | 40 | manner |
| suddenly | 31 | manner |
| over several hours | 23 | temporal |
| symptom → can → appear | 161 |
| symptom → can → develop | 120 |
| symptom → can → arise | 47 |
| symptom → can → manifest | 22 |
| symptom → could → appear | 8 |
| symptom → can → emerge | 8 |
| symptom → could → develop | 5 |
| symptom → can → show | 5 |
| symptom → can → surface | 4 |
| symptom → could → manifest | 3 |
| negative | neutral | positive |
| 0.581 | 0.393 | 0.026 |
| Raw frequency | 383 |
| Normalized frequency | 0.654 |
| Modifier score | 0.667 |
| Perplexity | 107.169 |