Incidence of adverse events in an integrated US healthcare system: a retrospective observational study of 82,784 surgical hospitalizations.

Patient Saf Surg · 2014 · PMC4055940 · PMID 24932219

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an unexpected trendno p-value reported

It was also particularly interesting to observe an unexpected trend between increasing patient age and a lower frequency of AEs related to invasive procedures.

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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.