Ginkgo biloba v placebo for preventing dementia in elderly people*
| At a median 6.1 years | ||||
| Outcomes | Ginkgo biloba | Placebo | RRI (95% CI) | NNH |
| Dementia | 18% | 16% | 11% (−6 to 29) | Not significant |
| Alzheimer disease | 17% | 14% | 15% (−3 to 35) | Not significant |
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*Abbreviations defined in glossary. RRI, NNH, and CI calculated from control event rates and hazard ratios in article.
