| as an anesthetic | 5 | manner |
| outside the or environment | 3 | location |
| in the perioperative period | 3 | temporal |
| ketamine → be → drug | 32 |
| ketamine → be → medication | 19 |
| ketamine → be → medicine | 5 |
| ketamine → be → essential medicine | 4 |
| negative | neutral | positive |
| 0.230 | 0.630 | 0.140 |
| Raw frequency | 60 |
| Normalized frequency | 0.867 |
| Modifier score | 0.500 |
| Perplexity | 35.904 |