Personality functioning scale: A scale to assess DSM-5’s Criterion A personality disorders

The Section III on Emerging Measures and Models included in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders, introduces a hybrid alternative approach, dimensional-categorical, to diagnose personality disorders. The Criterion A establishes the assessment of the impairment in personality functioning in terms of two dimensions: self and interpersonal. The present study was aimed at developing a short scale to measure both dimensions. The sample was composed of 342 adults from Buenos Aires city and its outskirts, with ages ranging from 19 to 82 years old (M = 39.90, SD = 13.75). Data were gathered using the Personality Functioning Scale, developed in this study, as well as the Personality Inventory for DSM‐5 Brief Form, the Mental Health Continuum Short Form, and the Symptom Check List-27. A principal components analysis conducted on 28 items found 2 factors, interpersonal and self. Internal consistency, estimated by ordinal Alphas, achieved values between .92 and .86 whilst Cronbach’s Alphas were .88 and .87. Significant and positive correlations between the Personality Functioning Scale scores on the one hand, and the Personality Inventory for DSM‐5 Brief Form scores and the Symptom Check List-27 score on the other, were found. Negative correlations between PFS scores and the Mental Health Continuum Short Form were calculated. As a result, a short scale with adequate psychometric features, suitable to assess Criterion A in adult Argentinian population has been developed.