Effectiveness of a Co-Production with Dialogue Program for Reducing Stigma against Mental Illness: A Quasi-Experimental Study with a Pre- and Post-Test Design.

For people with mental illnesses, stigma represents a barrier to social participation. Health professionals, including students, often hold stigma toward such individuals, Further, people with a mental illness often have self-stigma. This study aimed to both develop and examine the effectiveness of a new program based on co-production with dialogue for reducing stigma among both health science students and people with mental illnesses. This was a quasi-experimental study, with a pre- and post-test design and no control group. The sample comprised 28 university students majoring in occupational therapy and 20 community-dwelling people with mental illnesses. The Co-Production with Dialogue Program for Reducing Stigma (CPD-RS) was administered to this sample. Link's Devaluation Discrimination Scale (DDS) was used to assess whether the program reduced stigma. Compared to their preintervention scores, the students' postintervention DDS scores significantly decreased, persisting for at least one month, but those of people with mental illnesses showed no significant change. Both the students and the people with mental illnesses evaluated the program as "positive" through a questionnaire administered two months after the intervention. These results suggest that the CPD-RS reduces health science students' stigma toward people with mental illnesses and fosters mutual understanding between the two groups.