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Research ArticleRegular Articles

Clozapine's Effect on Recidivism Among Offenders with Mental Disorders

Mansfield Mela and Gu Depiang
Journal of the American Academy of Psychiatry and the Law Online March 2016, 44 (1) 82-90;
Mansfield Mela
Mansfield Mela is Associate Professor of Psychiatry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada. Dr. Gu Depiang is Research Associate, Correctional Services of Canada, Regional Psychiatric Centre, Saskatoon, Saskatchewan, Canada. Presented at the 44th annual meeting of the American Academy of Psychiatry and the Law, October 23–27, 2013, San Diego, CA.
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Gu Depiang
Mansfield Mela is Associate Professor of Psychiatry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada. Dr. Gu Depiang is Research Associate, Correctional Services of Canada, Regional Psychiatric Centre, Saskatoon, Saskatchewan, Canada. Presented at the 44th annual meeting of the American Academy of Psychiatry and the Law, October 23–27, 2013, San Diego, CA.
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    Figure 1.

    Survival analysis curves showing the decline in the nonclozapine group compared with the clozapine group. From the DCD, the clozapine group had a longer period in the community upon release before the first conviction.

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    Figure 2.

    Survival curves for the two medication groups showing time in months from first release date to DCD or date of first nonviolent conviction.

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    Figure 3.

    Survival curves for clozapine showing a longer time interval between the release date and the DCD or first conviction for a violent act.

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    Figure 4.

    Survival curves for clozapine showing shorter time interval than other medications between the release date and the DCD or first conviction for a sex crime.

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    Table 1

    Reconviction Rates for Four Offense Categories Comparing the Study Groups Throughout the Period of Follow-up

    Categories of ReconvictionClozapine (n = 41)Nonclozapine (n = 21)Fisher's Exact Test P
    Any/all offenses21 (51.2)11 (52.4)0.572
    Nonviolent19 (46.3)9 (42.9)0.505
    Violent13 (31.7)7 (33.3)0.558
    Sexual8 (19.5)2 (9.5)0.265
    • Data are the number (percentage of group).

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    Table 2

    Reconviction Rates for Four Offense Categories Comparing the Study Groups With a 2-Year Follow-up Period

    Categories of ReconvictionClozapine (n = 41)Nonclozapine (n = 21)Fisher's Exact Test p
    Any/all offenses10 (24.4)9 (42.9)0.115
    Nonviolent10 (24.4)6 (28.6)0.474
    Violent5 (12.2)6 (28.6)0.108
    Sexual4 (9.8)1 (4.8)0.444
    • Data are the number (percentage of group).

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    Table 3

    Mean Difference Between the Date of Release and the Date of First Reconviction for All Categories

    Offense CategoryClozapine − Nonclozapine (months)Confidence Interval
    Any reconviction10.2−5.4 to 25.9
    Nonviolent7.05−7.7 to 21.9
    Violent21.3−4.9 to 47.6
    Sexual8.6−15.2 to 32.3
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Journal of the American Academy of Psychiatry and the Law Online: 44 (1)
Journal of the American Academy of Psychiatry and the Law Online
Vol. 44, Issue 1
1 Mar 2016
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Clozapine's Effect on Recidivism Among Offenders with Mental Disorders
Mansfield Mela, Gu Depiang
Journal of the American Academy of Psychiatry and the Law Online Mar 2016, 44 (1) 82-90;

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Clozapine's Effect on Recidivism Among Offenders with Mental Disorders
Mansfield Mela, Gu Depiang
Journal of the American Academy of Psychiatry and the Law Online Mar 2016, 44 (1) 82-90;
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