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Prospective cohort study.
Calgary Early Psychosis Program, Calgary, Canada.
194 people with first episode psychosis (DSM-IV; mean age 24 years; 30% women. Exclusions: non-English speaking.)
Functioning prior to psychosis was assessed using the Premorbid Assessment Scale (PAS). Positive and negative symptoms of psychosis (Positive and Negative Syndrome Scale), social functioning (Quality of Life Scale), and substance abuse (Case Managing Rating Scale for Substance Use) were assessed at base line, 1, and 2 years. K-means cluster analysis was used to identify four patterns of premorbid function (stable-good, stable-intermediate, poor-deteriorating, and …
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