The inter-rater reliability and convergent validity of the Italian translation of the structured clinical interview for the DSM-5 alternative model of personality disorders module III in a psychotherapy outpatient sample

Objectives The present study aimed at assessing the inter-rater reliability of the Italian translation of the Structured Clinical Interview for the DSM–5 Alternative Model of Personality Disorders Module III (SCID-5-AMPD-III), the convergent validity of the SCID-5-AMPD-III personality disorder (PD) diagnoses with respect to the Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-5) Section II PD diagnoses, and the frequency of multiple PD diagnoses in a clinical sample of adult participants who were voluntarily asking for psychotherapy. Methods We relied on a pairwise interview design to assess the inter-rater reliability of the SCID-5-AMPD-III PD diagnoses in a sample of 84 adult clinical participants (53.6% female; participants’ mean age = 36.42 years, SD = 12.94 years) who voluntarily asked for psychotherapy treatment. Results Our findings showed that the SCID-5-AMPD-III PD diagnoses were provided with adequate inter-rater reliability (median Cohen’s k = .83). Convergent validity data for the SCID-5-AMPDIII PD diagnoses were also encouraging (median Cohen’s k = .54). Substantial agreement was observed between the SCID-5-AMPD-III and the SCID-5-PD on the frequency of multiple PD diagnoses (Cohen’s k value = .62). Conclusions Our data support the hypothesis that the SCID-5-AMPD-III PD diagnoses are provided with adequate inter-rater reliability and convergent validity with SCID-5-PD diagnoses, at least among Italian clinical adult participants.