| over a prolonged period of time | 6 | temporal |
| in levels of high concentration | 2 | location |
| through suffocation | 2 | manner |
| gas → cause → death | 40 |
| gas → bring → death | 9 |
| gas → result in → death | 9 |
| gas → lead to → death | 4 |
| gas → produce → death | 3 |
| negative | neutral | positive |
| 0.938 | 0.059 | 0.003 |
| Raw frequency | 65 |
| Normalized frequency | 0.552 |
| Modifier score | 0.550 |
| Perplexity | 377.486 |