| rarely | 5 | degree |
| no matter the cause | 3 | other |
| to prevent blindness | 3 | purpose |
| cataract → require → surgery | 49 |
| cataract → need → surgery | 7 |
| cataract → warrant → surgery | 5 |
| negative | neutral | positive |
| 0.432 | 0.505 | 0.063 |
| Raw frequency | 61 |
| Normalized frequency | 0.537 |
| Modifier score | 0.923 |
| Perplexity | 138.202 |