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A test-retest reliability study of the Structured Clinical Interview for DSM-III-R Personality Disorders (SCID-II) was conducted on 284 subjects in four psychiatric patient sites and two nonpsychiatric patient sites. For the patient sites, kappas ranged from .24 for obsessive—compulsive personality disorder to .74 for histrionic personality disorder, with an overall weighted kappa of .53. For the nonpatients, however, agreement was considerably lower, with an overall weighted kappa of .38. Mean duration of administration time was 36 minutes. Results of this study and other studies using the SCID-II suggest that the reliability and validity of the SCID-II are comparable with other instruments that diagnose Axis II disorders of the Diagnostic and Statistical Manual of Mental Disorders, but this new instrument has the advantage of a shorter time of administration.