| decades ago | 4 | temporal |
| to more than one | 3 | other |
| chemical → be → exposed | 12 |
| chemical → be → exposure | 5 |
| chemical → include → exposure | 3 |
| negative | neutral | positive |
| 0.499 | 0.445 | 0.057 |
| Raw frequency | 20 |
| Normalized frequency | 0.316 |
| Modifier score | 0.500 |
| Perplexity | 167.089 |