Tau PET Imaging With [<sup>18</sup>F]MK-6240: Limited Affinity for Primary Tauopathies and High Specificity for Alzheimer's Disease.

3.4 Simple Linear Regressions and Correlations Between Tau‐PET Signal and Cognition Simple linear regression between [ 18 F]MK‐6240 tau PET quantitative data and the global cognitive Z ‐score in the Aβ− population was slightly significant for the Braak ≤ 2 region ( R 2 = 0.13; p = 0.001), mostly driven by a few Aβ− uMCI and two FTD subjects.

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