No differences were detected between SCD A + and SCD A− (16.11 ± 6.60 vs 12.28 ± 2.36, p = 0.347, η2 = 0.04), SCD A + and MCI A– (p = 0.634, η2 = 0.01) and between MCI A + and AD (p = 0.455, η2 = 0.01) (Fig. 1). Here, SCD is linked to Alzheimer disease.