The article you requested is

Predictors of Suicide Attempt in Early-Onset Psychosis: Methodological Issues and Concerns

J Clin Psychiatry 2013;74(12):1264 [letter]

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To the Editor: With reference to the recent article by Sanchez-Gistau et al, we wish to discuss a few methodological issues and concerns not previously discussed regarding the study limitations.

Our first issue regards the suitability of some instruments (Positive and Negative Syndrome Scale [PANSS], [Hamilton Depression Rating Scale [HDRS]) for the study sample (aged 9–17 years) in view of their questionable or unknown validity in child and adolescent populations. The authors have not commented on this; however, the cross-referenced parent study indicates that adult scales were used for adolescent patients to act as a baseline comparison in their longitudinal cohort study.