A six year retrospective review of occipital nerve stimulation practice--controversies and challenges of an emerging technique for treating refractory headache syndromes.

J Headache Pain · 2013 · PMC3751236 · PMID 23919570

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did not reach statistical significanceno p-value reported

The analysed population was very small and differences observed between responders and non-responders did not reach statistical significance.

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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.