The Cochrane Handbook's guidelines for meta-analysis were followed when interpreting the I 2 test (0–40% = may not be significant, 30–60% = may represent moderate heterogeneity, 50–90% = may represent substantial heterogeneity, and 75–100% = significant heterogeneity).
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Local anesthesia with sedation and general anesthesia for the treatment of chronic subdural hematoma: a systematic review and meta-analysis.
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