Slovenian Version of the Drug-Induced Extrapyramidal Symptoms Scale: Evaluation of Interrater and Test-Retest Reliability

Abstract

Aim The Drug-Induced Extrapyramidal Symptom Scale (DIEPSS) is a multidimensional rating scale for the assessment of drug-induced extrapyramidal symptoms (EPS), developed in 1994. It is suitable for evaluating EPS considering the degree of influence EPS has on daily activities and the subjective distress that it causes. Method This study to evaluate the interrater and test-retest reliability of the DIEPSS Slovenian version conducted at the University Medical Center Maribor in Slovenia in November 2018. Results Six raters performed the interrater assessment of 135 DIEPSS video clips with recordings of patients with EPS. A second assessment was then performed by 2 raters to evaluate the test-retest reliability, which was high (interclass correlation coefficients from 0.743 to 0.936). Conclusions The results for the Slovenian language version of the DIEPSS show high interrater and test-retest reliability, with high concordance rates for all evaluated items (interclass correlation coefficient > 0.8).