Association of suicide attempts with acne and treatment with isotretinoin: retrospective Swedish cohort study.

BMJ · 2010 · PMC2978759 · PMID 21071484

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did not reach statistical significanceno p-value reported

In the internal cohort crossover analysis—that is, analysing outcomes before and after treatment in the same population—the differences in incidence did not reach statistical significance, making the estimated number needed to harm uncertain.

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