| in treating the depressive episodes | 5 | temporal |
| extremely | 3 | degree |
| for various types of occasional headaches | 3 | purpose |
| lithium → be → useful | 11 |
| lithium → be → suitable | 3 |
| lithium → be → good option | 3 |
| negative | neutral | positive |
| 0.035 | 0.369 | 0.596 |
| Raw frequency | 17 |
| Normalized frequency | 0.558 |
| Modifier score | 0.500 |
| Perplexity | 109.837 |