Tang Wai Kwong, Wong Eric, Chiu Helen F K, Lum C M, Ungvari Gabor S
Department of Psychiatry, Chinese University of Hong Kong, Hong Kong, SAR, China.
Int J Geriatr Psychiatry. 2005 Aug;20(8):783-9. doi: 10.1002/gps.1360.
The purpose of this study was to examine the unidimensionality, item fit, redundancy and differential item functioning (DIF) of the 15-item version of the Geriatric Depression Scale (GDS) in a community sample of 300 Hong Kong Chinese patients with pneumoconiosis.
Participants were randomly selected from the case register of the Pneumoconiosis Compensation Fund Board of Hong Kong. A trained research assistant administered the GDS to all participants. A psychiatrist, who was blind to the GDS scores, conducted a structured clinical interview to diagnose depressive disorders according to the Diagnostic and Statistical Manual for Mental Disorders, Version IV (DSM-IV) criteria.
Of the 300 participants, 37 (12.3%) had a DSM-IV diagnosis of depressive disorders. Eleven out of 15 items (73.3%) had INFIT/OUTFIT statistics between 0.7-1.3. Abbreviated versions were created by removal of misfit and redundant items resulting in similar overall performance as the original 15-item GDS. None of the items had significant DIF for age, level of education and cognitive impairment.
Although the GDS was overall unidimensional, there was evidence of item redundancy indicating that a shortened version would be as adequate as the original version.
本研究旨在检验老年抑郁量表（GDS）15项版本在300名患有尘肺病的香港中国社区患者样本中的单维度性、项目拟合度、冗余度及项目功能差异（DIF）。
参与者从香港尘肺病补偿基金委员会的病例登记册中随机选取。一名经过培训的研究助理对所有参与者进行GDS测试。一名对GDS分数不知情的精神科医生根据《精神疾病诊断与统计手册》第四版（DSM-IV）标准进行结构化临床访谈以诊断抑郁症。
300名参与者中，37名（12.3%）被DSM-IV诊断为患有抑郁症。15个项目中有11个（73.3%）的拟合指数/输出指数统计值在0.7至1.3之间。通过去除不拟合和冗余项目创建了简化版本，其总体表现与原始的15项GDS相似。没有项目在年龄、教育程度和认知障碍方面存在显著的项目功能差异。
尽管GDS总体上是单维度的，但有证据表明存在项目冗余，这表明简化版本与原始版本一样适用。
