| often | 10 | temporal |
| in certain special cases | 4 | other |
| in order to alleviate the symptoms | 4 | purpose |
| disease → require → surgery | 24 |
| disease → be → surgery | 3 |
| disease → need → surgery | 3 |
| disease → have → surgery | 3 |
| negative | neutral | positive |
| 0.512 | 0.405 | 0.083 |
| Raw frequency | 33 |
| Normalized frequency | 0.389 |
| Modifier score | 0.550 |
| Perplexity | 88.213 |