Implications of advancing paternal age: does it affect offspring school performance?

PLoS One · 2011 · PMC3177820 · PMID 21957460

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a clear trendno p-value reported

There was, however, a clear trend of diminishing grades with decreasing paternal age below 30 years.

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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.