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Factor scores in relation to a) group, b) age and c) Mini-Mental State Examination (MMSE). Controls (CN), individuals with mild cognitive impairment (MCI) and Alzheimer’s disease (AD) are shown respectively in white, light gray, and dark gray. The presence of group differences was statistically confirmed using ANOVA and the Steiger z test confirmed that Factor 1 had a stronger age effect (p < 0.001) and a weaker MMSE effect (p < 0.01) than Factor 2. Standard error bars are shown.
