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Correlation between serum vitamin D and SMDT raw values (a) and z-scores (b). SDMT is the neuropsychological test used to evaluate information processing speed. z-scores are normalized scores obtained after correction for age, sex, and educational levels according to the Italian normative values. We found a statistically significant positive correlation in both cases (rs: 0.38, p-value: 0.0005; rs: 0.33, p-value: 0.002).
