Criminal conviction and re-admission data were obtained on 91 patients released by the review board from Oak Ridge, the maximum security division of the Mental Health Centre, Penetanguishene, and related to the patients' pre-release characteristics. During the follow-up period, which varied among patients from one to four years, 38 per cent, of the sample were convicted of a crime, re-admitted to Oak Ridge, or both. Of the patients 15 per cent, were re-admitted and 16 per cent, committed a violent act against persons. Most of the violent patients were found to have committed violent crimes before. Patients diagnosed as personality or character disorders, particularly if they had never married, were more likely to get into trouble after release than those who were not.
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Quinsey et al. (1975) studied this question.