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Demographically-adjusted normative data for Symbol Digit Modalities Test (SDMT) among Sri Lankan adults
Sri Lanka Journal of Psychiatry 12(1): 18–24 · 2021
https://doi.org/10.4038/sljpsyc.v12i1.8284
Abstract
Background: Symbol Digit Modalities Test (SDMT) is a simple pencil-and-paper substitution task that measures divided attention, visual scanning and processing speed. It is sensitive to cognitive impairment in a wide variety of neuropsychiatric conditions. Extant normative data for the SDMT, mainly based on Western populations, may not be applicable for Sri Lankans. Aims: We aimed to create sex-, age- and education-adjusted regression-based norms for the SDMT for Sri Lankan adults. Methods: Four-hundred and twenty-two community-living adults (220 women, 52.1%), aged 18 to 83 years, with 5 to 23 years of education, completed the study. We conducted multiple linear regression analyses with sex, age and years of education to predict the SDMT score. Results: The SDMT scores of the sample ranged from 5 to 72, with a mean (SD) score of 35.98 (12.87). The regression model [predicted SDMT score = 29.395 - (1.549 × sex) - (0.434 × age in years) + (2.207 × years of education)] explained 56.5% of the variance in SDMT scores (adjusted R2 = 0.565; F=183; p
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