| often | 19 | temporal |
| for several hours | 16 | temporal |
| until swelling in the brain | 9 | temporal |
| symptom → be → delayed | 121 |
| symptom → have → delayed onset | 6 |
| symptom → be delayed in → onset | 3 |
| negative | neutral | positive |
| 0.571 | 0.399 | 0.030 |
| Raw frequency | 130 |
| Normalized frequency | 0.508 |
| Modifier score | 0.604 |
| Perplexity | 74.424 |