Aims: The "Discrimination and Stigma Scale" (DISC) was the first instrument specifically designed to evaluate reported experiences of discrimination by people with mental disorders. This study aims to validate DISC-12 version in Spanish population with Schizophrenia and, as specific objectives, to do the external validation with the Self-Stigma Questionnaire (SSQ) scale and Link PDD scale and to validate their internal consistency, temporal and inter-rater reliability.
Methods: 86 individuals with schizophrenia were interviewed at two time points (between one to two weeks) by two raters. Additionally to assess their sociodemographic and clinical characteristics, following scales were administered: DISC 12, SSQ, PDD, Social Functioning Scale (SFS) and Global Assessment of Function (GAF).
Results: Internal consistency as a whole results a Cronbach a between 0.741 and 0.850. Subscales "Unfair treatmen" and "Positive treatment" have a Cronbach a higher than 0.79, but the both subscales "Stopping Self" and "Overcoming stigma" do not have in themselves an adequate consistency. Test-retest reliability shows that four subscales have values higher than 0.67. Inter-rater reliability assessment result that 21 items score values above 0.8, 10 between 0.6-0.8 and one lower than 0.6. DISC-12 was significantly related with the second factor of the PDD (self-stigma) and SSQ.
Conclusions: The Spanish version of the DISC 12 scale is valid, has good internal consistency, is reliable both in terms of test-retest and inter-rater reliability and has good convergent validity with the SSQ and PDD, and the "Unfair treatment" and "Positive Treatment" subscales were the most robust of the four subscales.