The effects of aerobic activity on brain structure.

Front Psychol · 2012 · PMC3311131 · PMID 22470361

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failed to reach significanceno p-value reported

Differences in capillary density in cerebellum and the medulla oblongata failed to reach significance due to the high variability in baseline vascular density in control animals.

also in 4,113 other papers

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.