Table 1 Sample characteristics of the brain and blood cohorts included in the meta-analysis.

From: Epigenome-wide meta-analysis of DNA methylation differences in prefrontal cortex implicates the immune processes in Alzheimer’s disease

Dataset

Tissue

Sample size

Women N (%)

Cases N (%)

Age at death mean (SD)

Accession

Brain samples cohort

(1) ROSMAP cohort

PFC

726

461 (63.5%)

581 (80.0%)

86.3 (4.8)

Synapse: syn3157275

(2) Mt. Sinai cohort

PFC

141

88 (62.4%)

85 (60.3%)

85.8 (7.8)

GEO: GSE80970

(3) London cohort

PFC

107

64 (59.8%)

80 (74.8%)

84.6 (9.0)

GEO: GSE59685

(4) Gasparoni cohort

PFC

56

29 (51.8%)

36 (64.3%)

73.6 (14.7)

GEO: GSE66351

(5) London cohort

whole blood

69

44 (63.8%)

59 (85.5%)

83.6 (6.2)*

GEO: GSE59685

  1. Shown are numbers (and percentages) of samples after quality control.
  2. PFC prefrontal cortex.
  3. *Age at blood draw.