In order to mitigate against the possibility that individuals with sub-threshold levels of amyloid accumulation might be erroneously classified in the A− group, the primary analysis of 18F-Flortaucipir uptake vs. atrophy correlations were repeated with a lower amyloid threshold of 1.0 to determine group status. For this analysis, two subjects with 18F-Florbetaben scans were excluded.
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