Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands; Institute of Brain and Behavior Amsterdam, Amsterdam, the Netherlands; Biomechanics Laboratory, Fujian Medical University, Quanzhou, Fujian, PR China.
Exp Gerontol. 2023 Feb;172:112077. doi: 10.1016/j.exger.2022.112077. Epub 2022 Dec 29.
The Geriatric Depression Scale with 30 items (GDS-30) and with 15 items (GDS-15) are both valid tools for assessing depression in older adults, but their absolute values are not directly comparable. Here, we used a dataset (n = 431) with GDS-30 scores from a project concerning fall-risk assessment in older adults (FARAO) to develop and validate a formula which can be used to convert GDS-15 scores into GDS-30 scores. We found that the GDS-15 score cannot simply be multiplied by 2 to obtain the GDS-30 scores and that estimations of GDS-30 from GDS-15 are not affected by age, sex and MMSE. Therefore, the optimal formula to estimate the GDS-30 score from the GDS-15 score was: GDS-30_estimated = 1.57 + 1.95 × GDS-15. This formula yielded an estimate of GDS-30 with an explained variance of 79 %, compared to 63 % when GDS-15 was simply multiplied by 2. Researchers that have used the GDS-15 and want to compare their outcomes to other studies that reported only the GDS-30 are advised to use this formula.
30 项老年抑郁量表（GDS-30）和 15 项老年抑郁量表（GDS-15）都是评估老年人抑郁的有效工具，但它们的绝对值不可直接比较。在这里，我们使用了一个包含 431 名老年人跌倒风险评估项目（FARAO）中 GDS-30 评分的数据集，开发并验证了一个公式，可以将 GDS-15 评分转换为 GDS-30 评分。我们发现，GDS-15 评分不能简单地乘以 2 来获得 GDS-30 评分，而且 GDS-15 对 GDS-30 的估计不受年龄、性别和 MMSE 的影响。因此，从 GDS-15 估计 GDS-30 评分的最佳公式为：GDS-30_estimated = 1.57 + 1.95 × GDS-15。与将 GDS-15 简单地乘以 2 相比，该公式对 GDS-30 的估计解释方差为 79%，而前者为 63%。建议那些使用 GDS-15 并希望将其结果与仅报告 GDS-30 的其他研究进行比较的研究人员使用此公式。
