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The 10 clusters in the map of keyword co-occurrence.
| Cluster | Size | Silhouette |
|---|---|---|
| Risk factor (#0) | 62 | 0.875 |
| Hospital care (#1) | 46 | 0.753 |
| 12-month mortality (#2) | 44 | 0.734 |
| Non-cardiac surgery (#3) | 34 | 0.909 |
| Postoperative delirium (#4) | 32 | 0.84 |
| Population-based cohort study (#5) | 31 | 0.922 |
| Placebo-controlled study (#6) | 16 | 0.927 |
| Delirium risk factor (#7) | 13 | 0.901 |
| Psychometric evaluation (#8) | 10 | 1 |
| Placebo-controlled pilot study (#9) | 8 | 0.988 |
