Brain beta-amyloid measures and magnetic resonance imaging atrophy both predict time-to-progression from mild cognitive impairment to Alzheimer's disease.

(The percentiles being compared are reversed because greater Aβ is associated with greater risk, while smaller hippocampal volume is associated with greater risk.) Both Aβ load and MRI were highly significant predictors of progression overall ( P ≤ 0.001 for both) ( Table 2 ).

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