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subject - ID for the individual.
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sex - Gender, which takes values F (female) or M (male).
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ethnic - Ethnicity, simplified to Caucasian and Other.
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educ - Years of educational.
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e4grp - APOE-4 status, taking a value of E4 or Non-E4.
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age - Age, in years.
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mmse - Score from the Mini-Mental State Examination, which is a global cognitition evaluation.
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ham_d - Score on the Hamilton Rating Scale for depression.
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ham_a - Score on the Hamilton Rating Scale for anxiety.
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dig_sym - We (the authors of this R package) are unsure as to the meaning of this variable.
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delay_vp - We (the authors of this R package) are unsure as to the meaning of this variable.
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bfr_selective_reminding_delayed - We (the authors of this R package) are unsure as to the meaning of this variable.
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sitting - Self-reported time sitting per day, averaged to the nearest hour.
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met_minwk - Metabolic equivalent units score (activity level). A score of 0 means "no activity" while 3000 is considered "high activity".
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ipaq_grp - Classification of METminwk into Low or High.
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aca1 - Thickness of the CA1 subregion of the MTL.
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aca23dg - Thickness of the CA23DG subregion of the MTL.
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ae_cort - Thickness of a subregion of the MTL.
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a_fusi_cort - Thickness of the fusiform gyrus subregion of the MTL.
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a_ph_cort - Thickness of the perirhinal cortex subregion of the MTL.
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a_pe_cort - Thickness of the entorhinal cortex subregion of the MTL.
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asubic - Thickness of the subiculum subregion of the MTL.
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total - Total MTL thickness.
