This study compared the past-year prevalence rates of nonsuicidal self-injury produced by a behavioral checklist assessment and a single-item measure. In order to extend previous research on differences in prevalence rates across research samples, we employed both assessment types within a single sample of young adults (N = 433). Moreover, as an indicator of convergent validity, those rates were analyzed in association with participants' depression and anxiety scores. Findings indicated that the checklist assessment, relative to the single-item measure, produced a substantially higher prevalence rate, thereby providing greater evidence for the validity of its outcomes on the basis of convergence.
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