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Erschienen in:
01.10.2010
Using the Short Form-36 mental summary score as an indicator of depressive symptoms in patients with coronary heart disease
Erschienen in: Quality of Life Research | Ausgabe 8/2010
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Background
Depression is common in patients with cardiac disease; however, the use of depression-specific health instruments is limited by their increased responder and analyst burden. The study aimed to define a threshold value on the Short Form-36 (SF-36) mental component summary score (MCS) that identified depressed cardiac patients as measured by the Centre for Epidemiologic Studies Depression Scale (CES-D).
Methods
An optimal threshold was determined using receiver-operating characteristic (ROC) curves on SF-36 and CES-D data from a large cardiac cohort (N = 1,221). The performance of this threshold was evaluated in a further two cardiac populations.
Results
In the index cohort, an SF-36 MCS score of ≤45 was revealed as an optimal threshold according to maximal Youden Index, with high sensitivity (77%, 95% CI = 74–80%) and specificity (73%, 95% CI = 69–77%). At this threshold, in a second sample of hospital cardiac patients, sensitivity was 93% (95% CI = 76–99%) and specificity was 64% (95% CI = 49–77%). In a final sample generated from a community population, specificity was 100% (95% CI = 85–100%) and sensitivity was 68% (95% CI = 61–74%) at the cut-off of 45.
Conclusion
The SF-36 MCS may be a useful research tool to aid in the classification of cardiac patients according to the presence or absence of depressive symptoms.