White matter alterations in Parkinson's disease with normal cognition precede grey matter atrophy.

PLoS One · 2018 · PMC5755732 · PMID 29304183

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a slight trendno p-value reported

No other DTI parameter showed significant changes, although a slight trend was detected for MD and RD.

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failed to reach statistical significanceno p-value reported

The small sample size limits power of the statistical analyses and may cause that we failed to reach statistical significance in certain measures.

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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.