Incidence of adverse events in the Ginkgo biloba extract and control groups
| GBE group (n=178) | Control group (n=168) | Difference (P value) | |
| Adverse event (n (%)) | 5 (2.81) | 5 (2.98) | 1.0000 |
| Severe adverse event (n (%)) | 1 (0.56) | 4 (2.38) | 0.2032 |
GBE, Ginkgo biloba extract.