Assessing the effectiveness of greater occipital nerve block in chronic migraine: a systematic review and meta-analysis.

BMC Neurol · 2024 · PMC11380438 · PMID 39244547

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did not reach statistical significanceno p-value reported

However, the outcomes related to adverse effects did not reach statistical significance.

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may not be significantno p-value reported

While recognizing that statistical heterogeneity may not be significant when I 2 is < 40%, we performed this test.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.