Psychometric analysis of the brief symptom inventory 18 (BSI-18) in a representative German sample.

BMC Med Res Methodol 2017 01 26;17(1):14. Epub 2017 Jan 26.

Department of Medical Psychology and Medical Sociology, University of Leipzig, Leipzig, Germany.

Background: The BSI-18 contains the three six-item scales somatization, depression, and anxiety as well as the Global Severity Index (GSI), including all 18 items. The BSI-18 is the latest and shortest of the multidimensional versions of the Symptom-Checklist 90-R, but its psychometric properties have not been sufficiently clarified yet.

Methods: Based on a representative sample of N = 2516 participants (aged 14-94 years), detailed psychometric analyses were carried out.

Results: The internal consistency was good: Somatization α = .82, Depression α = .87, Anxiety α = .84 and GSI α = .93. Confirmatory factor analysis supported the three scales as second-order and GSI as first-order factors. The model fit based on RMSEA is good but that model fit based on CFI and TLI are too low.

Conclusions: Therefore, it is a very short, reliable instrument for the assessment of psychological distress. The BSI-18 can be used to reliably assess psychological distress in the general population. However, further studies need to evaluate the usefulness of standardization in clinical samples.

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Source
http://dx.doi.org/10.1186/s12874-016-0283-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5270206PMC
January 2017
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