Abstract
The objective of the present study was to determine the reliability of the Brazilian version of the Composite International Diagnostic Interview 2.1 (CIDI 2.1) in clinical psychiatry. The CIDI 2.1 was translated into Portuguese using WHO guidelines and reliability was studied using the inter-rater reliability method. The study sample consisted of 186 subjects from psychiatric hospitals and clinics, primary care centers and community services. The interviewers consisted of a group of 13 lay and three non-lay interviewers submitted to the CIDI training. The average interview time was 2 h and 30 min. General reliability ranged from kappa 0.50 to 1. For lifetime diagnoses the reliability ranged from kappa 0.77 (Bipolar Affective Disorder) to 1 (Substance-Related Disorder, Alcohol-Related Disorder, Eating Disorders). Previous year reliability ranged from kappa 0.66 (Obsessive-Compulsive Disorder) to 1 (Dissociative Disorders, Maniac Disorders, Eating Disorders). The poorest reliability rate was found for Mild Depressive Episode (kappa = 0.50) during the previous year. Training proved to be a fundamental factor for maintaining good reliability. Technical knowledge of the questionnaire compensated for the lack of psychiatric knowledge of the lay personnel. Inter-rater reliability was good to excellent for persons in psychiatric practice.
Highlights
The Composite International Diagnostic Interview (CIDI) is a fully standardized, structured interview that provides a psychiatric diagnosis through computerized algorithms [1], according to the International Classification of Diseases, 10th revised edition (ICD 10) [2] and the Diagnostic and Statistical
The reliability of the CIDI 2.1 was studied by the inter-rater method, which is used by an interviewer and an observer to interview the subject at the same time but making independent codifications
Special attention should be given to questions in which the lay examiner uses his/her personal judgment by making allowances for the inclusion of personal concepts, the reliability of the questionnaire is impaired
Summary
The Composite International Diagnostic Interview (CIDI) is a fully standardized, structured interview that provides a psychiatric diagnosis through computerized algorithms [1], according to the International Classification of Diseases, 10th revised edition (ICD 10) [2] and the Diagnostic and Statistical. Manual of the American Psychiatric Association, 4th edition (DSM IV) [3]. The CIDI can be administered to individuals older than 18 years regardless of their social, economic and cultural status, and does not depend on whether or not such patients are illiterate [7,8,9]. The CIDI is available in paper-and-pencil and computer-administered forms (selfadministered) with a diagnostic coverage for both lifetime and a 12-month period. The PFC leads the interviewer to a standardized decision tree (algorithm) that will deter-
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