| fully | 4 | degree |
| with a thin polymeric layer | 3 | other |
| in known forms | 2 | other |
| stent → be → covered | 16 |
| stent → have → covering | 6 |
| stent → be provided with → covering | 3 |
| negative | neutral | positive |
| 0.096 | 0.824 | 0.079 |
| Raw frequency | 25 |
| Normalized frequency | 0.438 |
| Modifier score | 0.500 |
| Perplexity | 218.541 |