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This graph illustrates that subjects who never used cannabis experience their first episode of psychosis at the oldest ages (mean ages in years) compared to those who used cannabis. In addition, the greater is the degree of exposure to cannabis (cannabis exposure scale expressed in type x frequency), the youngest is the mean age of onset of psychotic disorders. SD = standard deviation. As the age of onset is not normally distributed, we also report the median age in years (M = median).
