The local reliability of the 15-item version of the Geriatric Depression Scale: An item response theory (IRT) study
The local reliability of the 15-item version of the Geriatric Depression Scale: An item response theory (IRT) study
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DOI：
10.1016/j.jpsychores.2017.03.013
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发表时间：
2017-05-01
影响因子：
4.7
通讯作者：
Mecocci, Patrizia
中科院分区：
文献类型：
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作者：
Chiesi, Francesca;Primi, Caterina;Mecocci, Patrizia
包含15个条目的老年抑郁量表(GDS-15)是一种广泛使用的自我报告筛查工具。本研究旨在应用项目反应理论(IRT)为GDS-15的测量精度提供依据。以1344名老年人(男性=76.44岁，SD=5.13岁，女性占58.7%)为研究对象，研究了各条目的相对贡献度和量表在测量临界点附近特质水平的可靠性。采用一维双参数Logistic模型估计位置和坡度参数以及检验信息函数(TIF)。15件物品中有9件位于截止线附近，斜坡显示大多数物品具有很强的辨别能力。TIF在相应的截止点时达到峰值，证明了量表良好的局部可靠性。这些发现支持了GDS-15在检测老年人抑郁方面的效用。
The 15-item version of the Geriatric Depression Scale (GDS-15) is a self-report screening instrument widely used. The current study aimed at providing evidence of the measurement precision of the GDS-15 applying Item Response Theory (IRT). The relative contribution of each item and the reliability of the whole scale in measuring the trait level around the cutoffs were investigated employing data collected from a sample consisting of 1344 old people (M = 76.44 years, SD = 5.13; 58.7% women) involved in a large gerontological research project. The unidimensional two-parameter (2PL) logistic model was employed to item estimate location and slope parameters as well as the Test Information Function (TIF). Nine out of fifteen items were located around the cutoffs and the slopes showed that the majority of the items had substantial discrimination ability. The TIF peaked in correspondence of the cutoffs attesting the good local reliability of the scale. These findings support to the utility of the GDS-15 in detecting depression among older people.