TABLE 3.

Distribution of demographic variables and key AD biomarkers encountered in each cohort

	Female %	Age	Education	APOE ε4 %	MMSE	CDR	CDR‐SB	Hippocampus	A‐beta	t‐Tau	p‐Tau
A4	57.7	68, 71, 75	14, 16, 18	34.3	28, 29, 30	0.0, 0.0, 0.0	0.0, 0.0, 0.0	6, 7, 7
ADNI	47	68, 73, 78	14, 16, 18	45.6	26, 28, 29	0.0, 0.5, 0.5	0.0, 1.0, 2.0	5948, 6864, 7651	596, 854, 1396	193, 258, 350	17, 24, 34
AIBL	57.9	67, 73, 79	10, 12, 15	36	26, 28, 30	0.0, 0.0, 0.5	0.0, 0.0, 1.0	3, 3, 3	445, 567, 802	238, 366, 516	43, 64, 81
ANMerge	59.3	71, 77, 81	8, 11, 14	38.8	24, 28, 29	0.0, 0.5, 0.5	0.0, 0.5, 4.0	5311, 6270, 7142
EMIF	46.2	62, 68, 74	9, 12, 15	46.8	25, 28, 29	0.5, 0.5, 0.5		6357, 7223, 8004	385, 525, 739	160, 278, 504	37, 52, 74
EPAD	56.9	60, 66, 71	12, 15, 17	37.7	28, 29, 30	0.0, 0.0, 0.0	0.0, 0.0, 0.0	4413, 4808, 5182	899, 1319, 1700	162, 201, 252	13, 17, 22
JADNI	52.7	66, 72, 77	12, 12, 16	46.1	24, 26, 29	0.0, 0.5, 0.5	0.0, 1.5, 3.0	5260, 6133, 7132	254, 315, 454	67, 101, 138	36, 48, 73
NACC	57.2	65, 72, 79	12, 16, 18	40.6	23, 27, 29	0.0, 0.5, 0.5	0.0, 1.0, 4.0	43.5%	46.5%	43.9%	43.9%
ROSMAP	72.8	73, 79, 84	14, 16, 18	25.1	27, 29, 30

NOTE: We show the 25%, 50%, and 75% quantiles of numerical variables at baseline. Categorical variables are given as the proportion of participants falling into one respective category. APOE ε4%, Proportion of participants with at least one APOE ε4 allele; Hippocampus, A‐beta, t‐Tau, p‐Tau, NACC values are given as the proportion of “abnormal observations”.