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Reliability of the Camberwell Assessment of Need - European Version

EPSILON Study 6

Section of Community Psychiatry (PRiSM), Institute of Psychiatry, King's College London, UK

AART H. SCHENE, MD

Department of Psychiatry, Academic Medical Centre, Amsterdam, The Netherlands

HELLE CHARLOTTE KNUDSEN, MD

Institute of Preventive Medicine, Copenhagen University Hospital, Denmark

JOSÉ LUIS VÁZQUEZ-BARQUERO, FRCPsych

Clinical and Social Psychiatry Research Unit, University of Cantabria, Santander, Spain

ANTONIO LASALVIA, MD

Department of Medicine and Public Health, University of Verona, Italy

IAN R. WHITE

Medical Statistics Unit, London School of Hygiene and Tropical Medicine, London, UK

EPSILON STUDY GROUP

Correspondence: Paul McCrone, Section of Community Psychiatry (PRiSM), Institute of Psychiatry, King's College, London, De Crespigny Park, Denmark Hill, London SE5 8AF. Tel: 020 7848 0711; fax: 020 7277 1462

Declaration of interest No conflict of interest. Funding detailed in Acknowledgements.

Background The five-country European Psychiatric Services: Inputs Linked to Outcome Domains and Needs (EPSILON) Study aimed to develop standardised and reliable outcome instruments for people with schizophrenia. This paper reports reliability findings for the Camberwell Assessment of Need - European Version (CAN-EU).

Method The CAN-EU was administered in each country, at two points in time to assess test-retest reliability, and was rated by two interviewers at the first administration. Cronbach's , test-retest reliability and interrater reliability were compared between the five sites. Reliability coefficients and standard errors of measurement for summary scores were estimated.

Results Sites varied in levels and spread of needs. Alphas were 0.48, 0.58 and 0.64 for total, met and unmet needs respectively. Test-retest reliability estimates, pooled over sites, were 0.85 for the total needs, 0.69 for met needs and 0.78 for unmet needs. Pooled estimates for interrater reliability were higher, at 0.94, 0.85 and 0.79 for total, met and unmet needs respectively. There were statistically significant differences in interrater reliability between sites.

Conclusion The results confirm the feasibility of using CAN-EU across sites in Europe and its psychometric adequacy.

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