I am looking for data regarding the prevalence of mental disorders in german high schools (Gymnasium). Can anyone recommend a source?
You want to use epidemiology as a search term. One article that shows up is http://bmcpublichealth.biomedcentral.com/articles/10.1186/1471-2458-13-628
World Health Organization statistics are a good place to start. Their mental health page is at http://www.who.int/gho/mental_health/en/
This is a little dated, but you might want to check the "Bremer Jugendstudie” (BJS; English translation: Bremer Adolescent Study), which was conducted between May 1996 and July 1997. Google Scholar shows a number of reports from that study.
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