Psychological Medicine
October 1, 2011
R. Kuepper, J. Van Os, R. Lieb et al.
BackgroundCannabis use is considered a component cause of psychotic illness, interacting with genetic and other environmental risk factors. Little is known, however, about these putative interactions. The present study investigated whether an urban environment plays a role in moderating the effects of adolescent cannabis use on psychosis risk.MethodProspective data (n=1923, aged 14–24 years at...
BMJ
March 1, 2011
Rebecca Kuepper, Jim van Os, R. Lieb et al.
307 citations
OBJECTIVE: To determine whether use of cannabis in adolescence increases the risk for psychotic outcomes by affecting the incidence and persistence of subclinical expression of psychosis in the general population (that is, expression of psychosis below the level required for a clinical diagnosis). DESIGN: Analysis of data from a prospective population based cohort study in Germany (early...
Psychological Medicine
April 1, 2007
Audrey Cougnard, Machteld Marcelis, Inez Myin-Germeys et al.
Background. Research suggests that low-grade psychotic experiences in the general population are a common but transitory developmental phenomenon. Using two independent general population samples, the hypothesis was examined that common, non-clinical developmental expression of psychosis may become abnormally persistent when synergistically combined with developmental exposures that may impact...
European Addiction Research
1998
Peter Schuster, Roselind Lieb, Christina Maria Lamertz et al.
96 citations
This report presents findings of a community survey of 3,021 adolescents and young adults aged 14–24 years in Munich, Germany, carried out to determine the prevalence of use and abuse of and dependence on ecstasy, amphetamines and hallucinogens. The response rate was 71%. <b>Results:</b> (1) In 1995, 4% of the male and 2.3% of the female respondents aged 14–24 reported the use of ecstasy....