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Ranked feature importance values from all 11 features: a the classification of MCI-AD and CN and b the classification of MCI and CN. Numbers in bold indicate statistically significant associations (P < 0.05). CN, cognitively normal; MCI, mild cognitive impairment; AD, Alzheimer’s disease; OD, olfactory-stimulated oxygenation difference in the orbitofrontal cortex; SS, smoking status; HI, household income; YE, years of education; CCI, Charlson comorbidity index
