Table 1.

Characteristics of the studied datasets.

GEO series	Control samples	AD samples	Age ≤ 80	Age > 80	Male	Female	Data type
GSE5281	74	87	96	65	103	58	Validation cohort
GSE33000	157	310	298	169	258	209	Training cohort
GSE48350	173	80	142	111	124	129	Validation cohort
GSE122063	44	56	36	64	32	68	Validation cohort
GSE132903	98	97	49	146	99	96	Validation cohort
GSE36980	47	33	29	51	37	43	Validation cohort

Abbreviation: AD, Alzheimer's disease.