| very | 45 | degree |
| as true hepa filters | 36 | other |
| highly | 20 | degree |
| filter → be → effective | 357 |
| filter → be shown to be → effective | 3 |
| filter → prove to be → effective | 3 |
| negative | neutral | positive |
| 0.097 | 0.441 | 0.462 |
| Raw frequency | 363 |
| Normalized frequency | 0.794 |
| Modifier score | 0.400 |
| Perplexity | 59.717 |