| often | 25 | temporal |
| to help the patient | 12 | purpose |
| to establish a new access | 11 | purpose |
| condition → require → surgery | 190 |
| condition → need → surgery | 7 |
| condition → result in → surgery | 6 |
| condition → necessitate → surgery | 4 |
| condition → require → surgeon | 3 |
| condition → warrant → surgery | 3 |
| negative | neutral | positive |
| 0.504 | 0.436 | 0.060 |
| Raw frequency | 213 |
| Normalized frequency | 0.550 |
| Modifier score | 0.619 |
| Perplexity | 166.037 |