Table 6.

Study design underlying the four large microarray gene expression datasets

Study	Age Range	Platform	# Brains	# Samples	Approx.
	[youngest, oldest]				# Genes
Hawrylycz et al.	[24 years, 57 years]	Agilent 64 K	10	4063	20 000
		(custom array)
Miller et al.	[15 PCW, 21 PCW]	Agilent	4	1310	20 000
		Human 8 ×60 K
Kang et al.	[4 PCW, 82 years]	Affymetrix Human	57	1340	17 500
		Exon 1.0 ST
Colantuoni et al.	[14 PCW, 80 years]	Illumina	269	269	20 000
		(custom array)
Hernandez et al.	[1 year, 98 years]	Illumina	397	913	18 000
		HumanHT-12 V3.0

PCW stands for post conception weeks