| at the injection site | 12 | location |
| sometimes | 3 | temporal |
| at headache | 3 | other |
| vaccine → cause → swelling | 15 |
| vaccine → be → swelling | 7 |
| vaccine → have → swelling | 5 |
| vaccine → include → swelling | 4 |
| negative | neutral | positive |
| 0.734 | 0.251 | 0.015 |
| Raw frequency | 31 |
| Normalized frequency | 0.318 |
| Modifier score | 0.571 |
| Perplexity | 166.549 |