| with fever | 4 | other |
| occasionally | 3 | degree |
| with increased occurrence of hypertension | 2 | other |
| use → cause → headache | 19 |
| use → lead to → headache | 7 |
| use → result in → headache | 5 |
| use → be associated with → headache | 3 |
| negative | neutral | positive |
| 0.856 | 0.134 | 0.010 |
| Raw frequency | 34 |
| Normalized frequency | 0.288 |
| Modifier score | 0.433 |
| Perplexity | 191.504 |