An examination of the psychometric properties of the Hospital Anxiety and Depression Scale in Chinese patients with acute coronary syndrome.

The psychometric properties of the Hospital Anxiety and Depression Scale (HADS) as a screening instrument for patients with acute coronary syndrome (ACS) were investigated in a translated Chinese version of the instrument. A confirmatory factor analysis (CFA) was conducted on the HADS to establish its psychometric properties in 138 ACS patients over two observation points (within 1 week and 6 months post-admission for ACS). Internal and test-retest reliability values for the HADS total and HADS anxiety sub-scales were found to be acceptable. The HADS depression sub-scale lacked acceptable internal reliability. The underlying factor structure of the HADS comprised three distinct factors, though inconsistency between the best three-factor model fit was observed between observation points. The HADS was confirmed to be a useful screening instrument to assess symptoms of psychological distress in ACS patients. Further research is required to determine the most appropriate use of HADS sub-scale structures in clinical populations.