There were no group differences in %PPVT/year ( Table 3 ), but there was a nonsignificant trend of larger decreases in %PPVT/year across the PiB positivity groups [PiB(−) > PiB converter > PiB(+)].
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Longitudinal changes in amyloid positron emission tomography and volumetric magnetic resonance imaging in the nondemented Down syndrome population.
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