The finding of two subgroups of mentally handicapped male sex offenders has important implications for prevention, assessment and treatment.

In a study of 357 long-stay hospital residents aged 40 years and over, 30% had significant psychiatric disorder, while a retrospective survey of 215 new admissions over a seven-year period to a psychiatric unit for the mentally handicapped revealed that 20% of patients were aged 40 years and over. Both similarities and differences were found in the overall pattern of disorders between the two groups and a non-handicapped population in a comparable age-range.

The paper describes a special hospital-based treatment programme for male mentally handicapped offenders, comprising a package of practical and personal skills training coupled with a socialisation programme based on token-economy strategies within a controlled and structured environment. Twenty patients admitted to the programme and followed up after discharge for an average of 3.3 years were studied in detail. All had committed serious or persistent offences and showed a high level of psychosocial pathology. A good or fair response to the treatment programme was made by 85%, and 65% were judged well adjusted or reasonably well adjusted at last follow-up contact. A good outcome was associated with more than two years' in-patient care, a good response to the treatment programme and stable residential placement, regular occupation and regular supervision and support in the community. Offenders against the person (sex and assault) had a better prognosis than and showed other interesting differences from property offenders (property and arson).

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