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Published on: June 25, 2019
Validation of the Turkish Version of the DDQ-30: Norms and Clinical Utility for Detecting Lexical-Semantic
Fenise Selin Karalı1, Samet Tosun1, Elif İkbal Eskioğlu1,2
1Department of Speech and Language Therapy, Biruni University, Istanbul 34000, Turkey.
Objective:
This study adapted the Definition-based Naming Test (DDQ-30) into Turkish (DDQ-30 TR) and assessed its psychometric properties.
Method:
The adaptation process included translation, cultural and linguistic modifications, expert review, and pilot testing. Normative data were collected from 357 cognitively healthy Turkish adults aged 50-79. Known-group discriminant validity was examined in 150 participants, including healthy controls (n = 50), individuals with mild cognitive impairment (MCI; n = 60), and Alzheimer's disease (ad; n = 40).
Results:
DDQ-30 TR performance declined with age and improved with education. Norms were stratified by age, education, and sex. The test showed strong group validity (HC > MCI > ad) and acceptable reliability (α = 0.758).
Conclusions:
The DDQ-30 TR is a reliable, culturally adapted auditory naming tool that enables lexical-semantic assessment in Turkish-speaking older adults, particularly those with visual limitations. The DDQ-30 TR can be used as a supportive instrument within broader clinical screening protocols for neurocognitive disorders, especially among individuals with visual limitations.
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