The burden of premature opioid-related mortality.

Addiction · 2014 · PMC4171750 · PMID 25041316

Europe PMC DOI

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a significant trendno p-value reported

We used χ 2 tests to test for differences in the opioid-related death rate between 1991 and 2010 and the Cochran–Armitage test to assess for a significant trend in the proportion of deaths related to opioids between 1992, 2001 and 2010.

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