Aß40 assays	CS n=52		Pro-DLB n=33		DLB-d n=43		Pro-AD n=60		AD-d n=281
Aß40 assays	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Aß40§ (ng/L)	9923	3084	9157	3021	8070	3489	13 613	4576	10 969	3873	F=16.08 P<0.0001	CS, Pro-DLB, DLB-d<pro AD; DLB-d<AD d; pro-AD>AD-d
Aß42/Aß40	0.110	0.0336	0.102	0.0307	0.089	0.0402	0.050	0.0176	0.059	0.0241	F=63.78 P<0.0001	CS, pro-DLB, DLB-d>pro-AD, AD-d; CS>DLB-d

*Tukey post-hoc test for ANOVA (F), Kruskall-Wallis post-hoc test (H).
†Age at time lumbar of puncture and cognitive evaluation. Mean and SD.
‡Mean and SD.
§Aβ40 Innotest values: Aβ40 values were calculated with the equation: (Innotest Aβ1–40)=0.66 × (IBL Aβ1–40)+923 for centres using IBL kit (Paris, Montpellier, Lille and Rouen).
Aβ40, beta amyloid 1–40; AD, Alzheimer’s disease; AD-d, AD at demented stage; ANOVA, analysis of variance; CS, control subjects; DLB-d, dementia with Lewy bodies at demented stage; M, male; MMSE, Mini-Mental State Examination; Ph-Tau, phosphorylated tau; pro-AD, AD at prodromal stage; Pro-DLB, DLB at prodromal stage.