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Jan Christopher Cwik, Thomas Forkmann, Heide Glaesmer, Laura Paashaus, Antje Schönfelder, Dajana Rath, Sarah Caroline Prinz, Georg Juckel, Tobias Teismann

• \(\bf Background\) The German Capability for Suicide Questionnaire (GCSQ) was developed to measure fearlessness of death and pain tolerance – two constructs central to the Interpersonal Theory of Suicide. Initial scale development, definition of the factor structure and confirmation of the two-dimensional factor structure was performed in samples suffering from relatively low levels of suicide ideation/behavior. The present study aimed to validate the German Capability for Suicide Questionnaire (GCSQ) in a high-risk sample of suicidal inpatients. \(\bf Methods\) Factor structure, reliability and validity were investigated in a sample of inpatients (\(\it {N}\) = 296; 53.0% female; age in years: (\it {M}\) = 36.81, (\it {SD}\) = 14.27) admitted to a hospital due to a recent suicide attempt or an acute suicidal crisis (in immediate need of inpatient treatment). To establish convergent validity, interview-based assessments of lifetime suicide attempts and non-suicidal self-injury as well as questionnaire-based assessments of painful and provocative events were used. Finally, stability of GCSQ-scores over a follow-up period of 12 months was assessed. \(\bf Results\) Results indicated good psychometric properties, and provided additional evidence for construct validity and stability of the subscales over a one-year period, and demonstrated adequate fit of the data with respect to the original factor structure. \(\bf Conclusions\) Results suggest that the GCSQ is a brief, reliable, and valid measure of capability for suicide that can be used in clinic assessment and research.