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Change in composite cognitive index with time
| Number | Composite cognitive index mean (SD) scores | |||
| Preoperative | Predischarge | Three months | ||
| Placebo | 46 | +0.15 (0.75) | −0.08 (0.74) | +0.30 (0.70) |
| Low dose | 43 | +0.08 (0.76) | −0.24 (0.80) | +0.21 (0.90) |
| High dose | 38 | −0.01 (0.60) | −0.44 (0.87) | +0.03 (0.57) |
