Rationale and design. PRiSM Psychosis Study I

Area of Science:

• Psychiatry
• Mental Health Services Research
• Epidemiology

Background:

• The PRiSM Psychosis Study aimed to evaluate the effectiveness of community mental health teams in routine clinical settings.
• It addressed whether observed benefits from experimental studies can be replicated in ordinary practice and assessed potential dilution of these benefits.
• The study also investigated the associated costs of implementing these services.

Purpose of the Study:

• To determine if the treatment gains from community mental health teams in experimental settings can be achieved in routine clinical practice.
• To assess if the benefits of these services are diminished when applied in everyday clinical settings.
• To evaluate the cost-effectiveness of community mental health services for psychosis.

Main Methods:

• A prospective, non-randomized controlled trial was conducted in two phases: case identification and patient interviews.
• All prevalent cases of psychosis in two catchment areas were identified (1991-1992), with 514 patients identified.
• 302 patients were randomly allocated for interviews, including a clinician and carer, at two time points, two years apart.

Main Results:

• This paper details the socio-demographic, clinical, and ethnic profiles of the patients involved in the study.
• The characteristics of the interviewed patients were analyzed to understand their representativeness.

Conclusions:

• The patients with psychosis interviewed in the PRiSM Psychosis Study accurately represent the entire patient population identified through epidemiological methods.
• This finding supports the generalizability of the study's results to the wider population with psychosis receiving community mental health services.