A single Center study of the Symbol Digit Modalities test as a screening tool for cognitive impairment in Parkinson’s disease

The SDMT emerged as a promising screening tool to detect cognitive impairment in PD. The test's age and education corrected norms controlled for those variables and left diagnosis as the only predictor of performance. The MoCA scores were predicted by age, education, and diagnosis suggesting the education correction of the MoCA did not fully account for the influence of demographic variables.