| from the outdoor environment | 8 | location |
| mostly | 5 | degree |
| from road noise | 4 | cause |
| building → be → isolated | 33 |
| building → become → isolated | 5 |
| negative | neutral | positive |
| 0.209 | 0.611 | 0.180 |
| Raw frequency | 38 |
| Normalized frequency | 0.332 |
| Modifier score | 0.433 |
| Perplexity | 268.334 |