Prejudice Toward People With Mental Illness, Schizophrenia, and Depression: Measurement, Structure, and Antecedents

Many existing measures of prejudiced attitudes toward people with mental illness have conceptual, theoretical, and psychometric problems. The recently created Prejudice toward People with Mental Illness (PPMI) scale has addressed many of these limitations, but prejudice toward people with different mental disorders may be unique and require further exploration. This study aimed to facilitate this exploration by adapting the PPMI to focus on schizophrenia and depression, and investigate the structure, distinctiveness, and the nomological network of prejudice toward people with these mental disorders.

We adapted the original 28-item PPMI scale to create the Prejudice toward People with Schizophrenia (PPS) and Prejudice toward People with Depression (PPD) scales. There were 406 participants from the general population, who completed these scales and related measures.

The original 4-factor structure (fear/avoidance, unpredictability, authoritarianism, and malevolence) was supported for each scale. Participants expressed the highest levels of prejudice toward people with schizophrenia, followed by prejudice toward people with mental illness, and lastly by prejudice toward people with depression. Analyses supported the proposed nomological network of prejudice, which involves theoretical antecedents of social dominance orientation, right-wing authoritarianism, empathy, personality traits, disgust sensitivity, and prior contact.

This research provides evidence for the validity and psychometric properties of the PPMI, PPS, and PPD scales, expanding our understanding of antecedents to prejudice toward people with different mental disorders. This research also shows that we gain more insight into prejudice when we use measures targeting specific disorders rather than mental illness in general.