| almost always | 5 | temporal |
| very | 3 | degree |
| in outdoor air | 2 | location |
| radon → be → reduced | 17 |
| radon → be reduced to → low levels | 3 |
| radon → be reduced in → home | 3 |
| negative | neutral | positive |
| 0.232 | 0.527 | 0.241 |
| Raw frequency | 23 |
| Normalized frequency | 0.408 |
| Modifier score | 0.900 |
| Perplexity | 74.189 |