Barely Significant
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Low serum serotonin is associated with functional decline, mild behavioural impairment and brain atrophy in dementia-free subjects.

Brain Commun · 2025 · PMC11733688 · PMID 39816197

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Additionally, although we found a trend towards lower serotonin levels with higher prevalence of baseline MBI, this 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.