Clinical Interview for Psychotic Disorders (CIPD): Preliminary results on interrater reliability and comparisons with clinician performed diagnosis

Background: The Clinical Interview for Psychotic Disorders (CIPD) was developed by a multidisciplinary team considering the DSM-5 criteria for psychotic and affective disorders as well as relevant information from leading... [ view full abstract ]

Background: The Clinical Interview for Psychotic Disorders (CIPD) was developed by a multidisciplinary team considering the DSM-5 criteria for psychotic and affective disorders as well as relevant information from leading research in the area of assessment and evaluation of interventions in psychosis. In addition to diagnosis assessment, the CIPD has a clinical valence aiming the evaluation of the psychosocial correlates of symptoms (clinician and patient-rated) and, therefore, it is useful throughout the therapeutic process (e.g., in identifying targets for intervention, assessing change, evaluating the efficacy of psychosocial interventions) (Martins, Carvalho, Castilho, Pereira, & Macedo, 2015).

Aims: This study aims at presenting preliminary evidence of interrater reliability of the CIPD diagnosis and dimensional ratings: conviction (delusions), interference and severity (all psychotic symptoms). Moreover, the diagnosis resulting from the assessment with CIPD will be compared with the previously established psychiatrist’s diagnosis.

Methods: This is an ongoing study and the sample is still being collected. Over 30 patients with a diagnosis of a psychotic-spectrum disorder (including schizophrenia, schizoaffective disorder, schizophreniform disorder, substance induced psychosis, mood-related disorders with psychotic features) will be assessed with the CIPD. An independent assessment will be carried out by two experienced clinical psychologists from the research team that will be blind to the working diagnosis given by each patient’s psychiatrist.

Results: Our statistical analysis’ plan includes: Interclass Correlation Coeficient (single and average measures), Concordance Correlation Coefficient (precision and accuracy) and Weighted Kappa. 

Conclusions: It is hypothesized that the CIPD will present adequate interrater and ‘clinician versus researcher assessment’ reliability. With replication and further study the CIPD has the potential to be a useful measure to: a) aid in the establishment of a diagnosis; b) comprehensively assess symptoms and their psychosocial correlates; and c) to evaluate psychosocial interventions and therapeutic change with people with psychosis.

Key-words: Assessment, Interview, Psychosis, Psychosocial