Symbol Digit Modalities Test: Normative data for the Latin American Spanish speaking adult population
J C Arango-Lasprilla1,2, D Rivera2, G Rodríguez3
1IKERBASQUE, Basque Foundation for Science, Bilbao, Spain.
Neurorehabilitation
|December 8, 2015
Summary
This study generated normative data for the Symbol Digit Modalities Test (SDMT) in 11 Latin American countries. Norms were adjusted for age and education, but not gender, due to minimal effect size.
Area of Science:
- Neuropsychology
- Cognitive Assessment
- International Health
Background:
- The Symbol Digit Modalities Test (SDMT) is a widely used measure of cognitive processing speed.
- Normative data is essential for accurate interpretation of SDMT scores.
- Existing SDMT norms may not adequately represent diverse populations in Latin America.
Purpose of the Study:
- To establish normative data for the SDMT across 11 Latin American countries.
- To investigate the influence of gender, age, and education on SDMT performance in this region.
- To provide culturally relevant norms for neuropsychological assessments in Latin America.
Main Methods:
- A multicenter study involving 3,977 healthy adults from 11 Latin American countries.
- Standardized administration of the SDMT within a larger neuropsychological battery.
- A five-step statistical procedure for norm generation and adjustment.
Main Results:
- Multiple linear regression models explained 29-56% of the variance in SDMT scores.
- Gender differences were observed in four countries but had small effect sizes (<0.3).
- Country-specific norms were developed, with adjustments primarily for age and education.
Conclusions:
- This is the first multicenter study to provide normative data for the SDMT in Latin America.
- The generated norms will enhance the accuracy of neuropsychological assessments in the region.
- This research is expected to significantly impact the practice of neuropsychology across Latin America.
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