| normally | 3 | degree |
| at the injection site | 2 | location |
| vaccine → cause → headache | 14 |
| vaccine → have → headache | 7 |
| vaccine → be → headache | 5 |
| negative | neutral | positive |
| 0.751 | 0.210 | 0.040 |
| Raw frequency | 26 |
| Normalized frequency | 0.294 |
| Modifier score | 0.850 |
| Perplexity | 232.077 |