| directly | 6 | manner |
| in patients with panic disorder | 6 | other |
| clearly | 5 | degree |
| symptom → be related to → duration | 12 |
| symptom → depend on → duration | 6 |
| symptom → depend on → the length of time | 3 |
| negative | neutral | positive |
| 0.418 | 0.554 | 0.028 |
| Raw frequency | 21 |
| Normalized frequency | 0.262 |
| Modifier score | 0.500 |
| Perplexity | 260.488 |