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Validation of the Zung self-rating depression scale (SDS) in older adults
Authors:Jari Jokelainen  Markku Timonen  Sirkka Keinänen-Kiukaanniemi  Pirjo Härkönen  Heidi Jurvelin  Kadri Suija
Affiliation:1. Center for Life Course Health Research, University of Oulu, Oulu, Finland;2. Unit of General Practice, Oulu University Hospital, Oulu, Finland;3. jari.jokelainen@oulu.fi;5. Health Center of Oulu, Oulu, Finland;6. Department of Family Medicine, University of Tartu, Tartu, Estonia
Abstract:Abstract

Objective: The main objective of this study was to investigate the psychometric properties of the Zung Self-Rating Depression Scale (SDS) and evaluate screening parameters capability of the SDS with the Beck Depression Inventory (BDI-21) among the elderly population.

Design: A population-based study

Setting: Community

Subjects: 520 adults, aged 72–73 years, living in the city of Oulu, Finland.

Main outcome measures: The screening parameters of the SDS questions and BDI-21 for detecting severity of depression. The Mini Neuropsychiatric Interview for diagnosing major depression.

Results: The optimal cut-off point for the SDS was 39. The sensitivity and specificity parameters for this cut-off point were 79.2% (95% CI 57.8–92.9) and 72.2% (95% CI 67.9–76.1), respectively. Positive and negative predictive values were 12.5% (95% CI 7.7–18.8) and 98.6% (95% CI 96.7–99.5), respectively. Moreover, there was no statistically significant difference in diagnostic accuracy indices of the cut-off points 39 and 40. In a receiver operating characteristic analysis, the area under the curve was 0.85 (95%CI 0.77–0.92) for the SDS total score and 0.89 (95% CI 0.83-0.96) for the BDI-21 (p?=?0.137).

Conclusion: Using the traditional cut-off point, the SDS was convenient for identifying clinically meaningful depressive symptoms in an elderly Finnish population when compared with the BDI-21 which is one of the most commonly used depression screening scales. The sensitivity and specificity of these two screening tools are comparable.

Based on our study, the SDS is convenient for identifying clinically meaningful depressive symptoms among older adults at the community level.
  • Key points
  • The widely used Zung Self-Rating Depression Scale (SDS) has not previously been validated among elderly people at the community level.

  • The sensitivity and specificity of SDS (cut-off point 39) were 79.2% and 72.2%.

  • The positive and negative predictive values for SDS were 12.5% and 98.6%.

  • SDS is convenient for identifying major depression in an elderly population and regarding sensitivity and specificity comparable to BDI-21.

Keywords:BDI-21  Diagnostic methods  elderly  major depression  statistics
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