Psychiatric morbidity (defined as the history of at least one psychiatric or dual disorder) was assessed using two different approaches, with different temporal windows for detecting diagnoses registered in NPR. Both approaches relied on the same definitions and categorizations described above. To approximate a lifetime prevalence, we calculate a ten-year prevalence by including any psychiatric diagnosis in the NPR, regardless of when it was registered relative to the prison sentence. Dual disorders were also defined irrespective of time between diagnoses. In estimating the burden of psychiatric morbidity upon entry to prison, only diagnoses registered in the last 12 months prior to entering prison were included. For persons with more than one entry to prison during the observation period, a new 12-month prevalence was recorded for each new entry.
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