Table 1.

Aβ groups definitions

	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

“Low burden” refers to “low burden of Aβ pathology”. Abbreviations: Aβ amyloid-β, CL Centiloid, CSF cerebrospinal fluid, VR visual read