Validation of a short instrument to measure stigmatised attitudes towards mental illness

AIMS AND METHOD One of the steps to change stigmatised attitudes involves identifying the concerns of people whose attitude is to be changed. This paper presents the Attitudes to Mental Illness Questionnaire (AMIQ), a short instrument aimed at systematically obtaining this information, and examines the feasibility, test–retest reliability as well as face and construct validity of the AMIQ on the UK general public. A postal survey of a random sample of 1079 adults was conducted. A self-reported questionnaire with 5-point Likert scale responses was validated in response to short fictional vignettes. A second subsample of 256 was used for a reliability test. RESULTS The AMIQ is a short instrument with good psychometric properties. It shows good stability, test–retest reliability, alternative test reliability, face, construct and criterion validity. The self-selecting sample of 1079 UK adults showed highly stigmatised attitudes to people with addictive disorders but more positive attitudes to those with depression or self-harm. Results from a smaller follow-up sample showed that attitudes towards people with alcohol dependence and schizophrenia were intermediate. CLINICAL IMPLICATIONS The AMIQ can be used in various medical and mental health stigma research and intervention settings.