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The symptoms of depression which are clinically significant are present among 8 to 16% of older adult population. More than 20 years ago the 30-item Geriatric Depression Scale (GDS-30) was developed. The 15-item GDS-15 is derived from the 30-item GDS and it is one of the most widely used instruments for screening for depression among older adults. Objective: The aim of the study was to evaluate reliability, validity and the factor structure of the GDS-15 among Serbian elderly population. Method: Two hundred and forty nine subjects aged 65 and over participated in the study. Results: The GDS-15 scale was found to have high internal consistency with Cronbach's alpha=0.935, which means that the reliability of the scale is good. The coefficient of testretest reliability was 0.95. Principal Components Analysis produced 4 factors within the depressed group. The first factor accounted for 36.7% of the variance, the second, third, and fourth accounted for additional variability of 7.8, 7.0, and 6.7%, respectively, accounted for the explanation of 58.2% of the total variance. The score level 3 was found to be the best cut-off point for GDS-15 with sensitivity 87.6 and specificity 87.5. Ranging from 4 to 7, the cut-off scale was also well discriminative. Taking our results and data from the previous research into consideration, our suggestion for the optimal cut-off value is 4. Conclusion: We can conclude that our results are very similar to the research that has been conducted in other countries so far, and that the results satisfy all the criteria of successful validation. The Serbian version of the GDS will be helpful for screening and treating depressive disorders among this population.

The Serbian version of the geriatric depression scale: Reliability, validity and psychometric features among the depressed and non-depressed elderly