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Differential Item Functioning Analysis On The Geriatric Depression Scale-15: An Iterative Hybrid Ordinal Logistic Regression, Elahe Allahyari

BioMedicine

The elderly population has extensively increased globally, so depression like a common problem in late life may convert to one of the economic, social, and health challenges of the 21st century. Due to the high cost of clinical diagnosis of depression, it is necessary to provide effective questionnaires like the 15-item Geriatric Depression Scale (GDS-15) for screening. But, the measurement invariance of GDS-15 is still unknown in the general population. In our study, 1473 participants of all Iranʼs ethnic groups were asked to answer GDS-15 and demographic factors such as human settlements, employment, disease, marital status, age, gender, homebound, financial …