Comparing Personality Diagnostic Questionnaire-4+ with longitudinal, expert, all data (LEAD) standard diagnoses in a sample with a high prevalence ofaxis I and axis II disorders

A comparison between the Personality Diagnostic Questionnaire-4+ (PDQ-4+) a nd Longitudinal, Expert, All Data (LEAD) standard diagnoses was made in a s ample of 100 patients with a high prevalence of both axis I and axis II dis orders. The internal consistency was considered acceptable (alpha>.70) for 3 of 12 PDO-4+ scales. Diagnostic agreement between the assessment methods was poor for specific personality disorders (PDs), The PDO-4+ gave many fal se-positive diagnoses. Changing the diagnostic thresholds only marginally i ncreased the agreement between methods or the diagnostic efficiency of the PDO-4+. Multiple regression analyses showed that the discrepancies between the methods were strongly associated with the current level of perceived sy mptoms (SCL-90-R). Copyright (C) 2000 by W.B . Saunders Company.