| in treating depression | 19 | other |
| for depression | 13 | purpose |
| for chronic and acute pain | 10 | transitive-object |
| ketamine → be → effective | 79 |
| ketamine → be → effective treatment | 7 |
| ketamine → be shown to be → effective | 6 |
| ketamine → be → valuable and highly effective treatment | 3 |
| negative | neutral | positive |
| 0.037 | 0.330 | 0.633 |
| Raw frequency | 95 |
| Normalized frequency | 1.000 |
| Modifier score | 0.400 |
| Perplexity | 136.126 |