Table 1.

Data sets included in the current study.

Tissue type	Platform	Dataset	Sample size
			HC	LC	COPD	LC + COPD
Lung tissue	GPL570 [HG‐U133_Plus_2] Affymetrix Human Genome U133 Plus 2.0 Array	GSE43580, GSE31210, GSE37768	17	226	0	0
	GPL96 [HG‐U133A] Affymetrix Human Genome U133A Array	GSE10072	151	42	0	0
Airway epithelial cell	GPL570 [HG‐U133_Plus_2] Affymetrix Human Genome U133 Plus 2.0 Array	GSE64614, GSE43939, GSE5058 GSE13933, GSE19667, GSE63127 GSE8545, GSE22047, GSE20257 GSE11952, GSE30063, GSE11784 GSE11906, GSE10006	366	0	91	0
	GPL96 [HG‐U133A] Affymetrix Human Genome U133A Array	GSE994, GSE19027	26	21	0	0
	GPL1708 [Agilent‐012391 Whole Human Genome Oligo Microarray G4112A]	GSE12428, GSE12472	0	0	36	36