Psychometric Properties of the German Version of the Benzodiazepine Dependence Self-Report Questionnaire

Abstract To facilitate measurement and screening of benzodiazepine/Z-drug dependence, the Dutch “Benzodiazepine Dependence Self-Report Questionnaire” was translated into German (Bendep-SRQ-GV) and psychometrically evaluated. A cross-sectional online study with 343 benzodiazepine/Z-drug users was conducted. Structural validity and reliability were assessed using confirmatory factor analysis, while convergent validity was evaluated through correlation and receiver operating characteristic analyses with the “Severity of Dependence Scale” (SDS). Furthermore, the use of simple sum subscale and total scale scores was reviewed. A model with four first-order factors and one second-order factor fitted the data best. The questionnaire showed good to excellent reliability. The scores correlated satisfactorily with the model-based factor scores and the SDS, indicating good convergent validity and supporting the use of simple sum scores. The study provided strong evidence for the validity and reliability of the Bendep-SRQ-GV as a measure of benzodiazepine/Z-drug dependence, which represents a significant step towards developing a multidimensional screening tool.