The Geriatric Depression Scale (GDS) is a 30-item self-report assessment used to identify depression in the elderly. The scale was first developed in 1982 by J.A. Yesavage and others.
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Description
In the Geriatric Depression Scale, questions are answered "yes" or "no." A five-category response set is not utilized in order to ensure that that the scale is simple enough to be used when testing ill or moderately cognitively impaired individuals, for whom a more complex set of answers may be confusion, or lead to inaccurate recording of responses.
The GDS is commonly used as a routine part of a comprehensive geriatric assessment. One point is assigned to each answer and the cumulative score is rated on a scoring grid. The grid sets a range of 0-9 as "normal", 10-19 as "mildly depressed", and 20-30 as "severely depressed".
A diagnosis of clinical depression should not be based on GDS results alone. Although the test has well-established reliability and validity evaluated against other diagnostic criteria, responses should be considered along with results from a comprehensive diagnostic work-up. A short version of the GDS (GDS-SF) containing 15 questions has been developed, and the scale is available in languages other than English. The conducted research found the GDS-SF to be an adequate substitute for the original 30-item scale.
The GDS was validated against Hamilton Rating Scale for Depression (HRS-D) and the Zung Self-Rating Depression Scale (SDS). It was found to have a 92% sensitivity and a 89% specificity when evaluated against diagnostic criteria.
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Scale questions and scoring
The scale consists of 30 yes/no questions. Each question is scored as either 0 or 1 points. The following general cutoff may be used to qualify the severity:
- normal 0-9,
- mild depressives 10-19,
- severe depressives 20-30.
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