Heidelberg Coping Scales for Delusions: psychometric evaluation of an expert rating instrument.

Background: Coping is of substantial relevance in the treatment and course of psychiatric disorders. Standardized instruments to assess coping with psychotic symptoms, particularly delusions, are rare. The aim of this study was to develop and evaluate the psychometric properties of a new instrument to assess coping strategies in the context of delusional experiences: the Heidelberg Coping Scales for Delusions (HCSD).