Scale-Description

The Geriatric Depression Scale (GDS-15) is a brief assessment tool designed for detecting depression in older adults. It is a shortened version of the original Geriatric Depression Scale, which included 30 items. The GDS-15 consists of 15 questions focused on symptoms of depression, using yes/no answers. The questions are designed to be understandable and relevant for elderly individuals.

Data Analysis and Usage

Data analysis from the GDS-15 involves counting the number of positive responses (no) for each question. The total score ranges from 0 to 15, with higher scores indicating greater levels of depression. The tool is used to identify symptoms of depression and assess their severity.
Clinical professionals can use the results to diagnose depression, monitor treatment progress, or evaluate the emotional state of elderly patients. In data analysis, the sensitivity and specificity of the tool can be examined by comparing it to other scales or diagnostic criteria.

Purpose

The primary goal of the GDS-15 is to provide a quick and reliable method for detecting depression in older adults. It was specifically designed to be easy to understand and complete for elderly individuals, and to provide a useful tool for clinicians working with this population. The scale helps in diagnosing and managing depression, thereby improving the overall quality of life for older adults.

Calibration

The calibration of the GDS-15 has been done through studies that compare its results with other validated depression scales, such as the Beck Depression Inventory (BDI). Validation studies have shown that the GDS-15 has good sensitivity and specificity for diagnosing depression in the elderly. Typically, a score above 5 may indicate potential depression, though the exact threshold may vary depending on the population and study.

References

Sheikh, J. I., & Yesavage, J. A. (1986). Geriatric Depression Scale (GDS): Recent evidence and development of a shorter version. Clinical Gerontologist, 5(1-2), 165-173.
Yesavage, J. A., & Sheikh, J. I. (1986). Depression in elderly patients: Validation of a short-form of the Geriatric Depression Scale. Journal of the American Geriatrics Society, 34(6), 386-389.
Friedman, R., & Katz, S. (1996). Screening for depression in elderly primary care patients. International Journal of Geriatric Psychiatry, 11(1), 47-51.