The diagnosis of personality disorders: a pilot study.

A pilot study was carried out to see what levels of agreement on the diagnosis of the different types of personality disorder, described by Schneider, could be obtained by observers with different amounts of clinical experience. Audio-recordings of eight patients were examined by 10 raters, who represented three levels of experience. Two patients had the same diagnosis made by 80 percent of the raters and these cases seemed best described as "typical". In all the cases agreement was increased when a second choice diagnosis was permitted. Significantly greater agreement was recorded by clinical clerks than by psychiatrists or psychiatric residents, though this was probably due to their making use of fewer of the types. It seemed probable that some types were less likely than others to be used for a first choice diagnosis. It is recommended that the most typical patients be employed in research in the field of the personality disorders if high diagnostic reliability is required.