A brief screener for impairment in personality functioning: Psychometric validation of the Five-Item Screening Scale for Personality Disorders in a Dutch-speaking clinical sample.

Personality disorders (PDs) are characterized by problems with identity and self-direction. Since the recent dimensional PD models of the Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-5) and the International Statistical Classification of Diseases and Related Health Problems, 11th edition, the role of identity and self-direction in personality pathology has been made explicitly by including these problems in a general personality pathology criterion. This criterion reflects impairment in personality functioning (IPF), which is assessed on a continuum to determine the severity of personality pathology. The present study aimed to psychometrically evaluate the Five-Item Screening Scale for Personality Disorders (FISSPD; Skodol et al., 2011), a short screener for IPF, in a Dutch-speaking clinical sample of 820 adults. This screener mainly taps into self-related impairment, with four items measuring self-related impairment and one item measuring interpersonal impairment. The factor structure, scale reliability, measurement invariance (across sex, age, and patients with vs. without PD), and convergent validity were investigated. The Dutch FISSPD showed a unidimensional structure and good scale reliability. Scalar measurement invariance was established across sex, age (patients below vs. above age 40), and patients with versus without PD. The Dutch FISSPD was significantly related to identity and all DSM-IV/5 Section-II PD symptoms. The present study indicates that the Dutch FISSPD has potential as a reliable and valid screener for personality pathology in adult patients.