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Table 1 Aβ groups definitions

From: Cognitively unimpaired individuals with a low burden of Aβ pathology have a distinct CSF biomarker profile

  Aβ- Low burden Aβ+
Definition 1 CSF- and CL < 30 CSF+ and CL < 30 CSF+ and CL > 30
Definition 2 CSF- and VR- CSF+ and VR- CSF+ and VR+
Definition 3 CL < 20 20–40 CL CL > 40
  1. “Low burden” refers to “low burden of Aβ pathology”. Abbreviations: amyloid-β, CL Centiloid, CSF cerebrospinal fluid, VR visual read