| to be idiopathic | 2 | purpose |
| disease → be → primary | 20 |
| disease → be called → primary | 8 |
| disease → be determined to → be primary | 3 |
| negative | neutral | positive |
| 0.534 | 0.447 | 0.018 |
| Raw frequency | 31 |
| Normalized frequency | 0.379 |
| Modifier score | 0.400 |
| Perplexity | 435.107 |