Efficacy and safety of <i>Ginkgo biloba</i> leaf extract injection for vascular cognitive impairment: a systematic review and meta-analysis.

Although the test for subgroup differences did not reach statistical significance (P = 0.39), it still suggests that cognitive improvement may be associated with longer treatment duration.

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Subgroup analysis stratified by treatment duration (≤2 weeks, 2∼4 weeks, 4∼6 weeks, and >6 weeks) showed a positive trend in cognitive improvement with prolonged treatment.

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