Meta-Analysis of Serum Insulin-Like Growth Factor 1 in Alzheimer's Disease.

PLoS One · 2016 · PMC4881955 · PMID 27227831

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a clear trendno p-value reported

However there does not appear to be a clear trend in any of these parameters, and the limited number of studies reporting these measures precludes statistical analysis.

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a significant trendno p-value reported

While eight out of the nine studies included in this meta-analysis detected a statistically significant increase or decrease in serum levels of IGF-1 in Alzheimer’s disease subjects, the analysis as a whole did not show a significant trend in either direction.

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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.