Myofascial pain syndrome: a treatment review.

Pain Ther · 2013 · PMC4107879 · PMID 25135034

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highly significantno p-value reported

Compared to placebo, amitriptyline demonstrated a statistically significant reduction in tenderness ( P = 0.01) and a highly significant reduction in headache intensity [ 36 ].

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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.