Assessing cognitive representations of mental health problems. I. The illness perception questionnaire for schizophrenia.
OBJECTIVE
To design a questionnaire to assess cognitive representations of mental health problems held by people diagnosed with schizophrenia.


BACKGROUND
Personal beliefs about health problems have been reliably associated with emotional and behavioural responses to those health problems and health outcomes. This area has been extensively explored in relation to physical health, but somewhat neglected in mental health. In this study, a questionnaire designed to assess key beliefs about physical illness (the Illness Perception Questionnaire - Revised) was modified for use in exploring beliefs about schizophrenia. The new measure was termed the Illness Perception Questionnaire for Schizophrenia (IPQS).


METHODS
Participants were 124 people with a diagnosis of schizophrenia who completed the IPQS and additional measures to assess symptom severity, emotional state, and attitudes towards medication. The psychometric properties of the IPQS were analysed, including internal consistency, test-retest reliability, and discriminant and concurrent validity.


RESULTS
The IPQS subscales were shown to be internally reliable, and reliable over time. Correlations with measures of symptom severity, emotional state, and attitudes towards adherence to medication showed that the subscales were measuring the constructs that they were designed to measure.


CONCLUSIONS
The IPQS is a reliable and valid measure of cognitive representations of mental health problems held by people with a diagnosis of schizophrenia.
Lobban
Fiona
F
Department of Clinical Psychology, University of Liverpool, UK. fiona.lobban@liverpool.ac.uk
Barrowclough
Christine
C
Jones
Steven
S
D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D014150:Antipsychotic Agents / Q000627:therapeutic use; D001294:Attitude to Health; D002908:Chronic Disease; D003071:Cognition; D003430:Cross-Sectional Studies; D003469:Culture; D005260:Female; D005500:Follow-Up Studies; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D015203:Reproducibility of Results; D012559:Schizophrenia / Q000188:drug therapy; D012649:Self Concept; D011795:Surveys and Questionnaires
D014150:Antipsychotic Agents