study	n1	mean1	sd1	n2	mean2	sd2
GSE29548	6	11.69	0.64	6	11.16	0.6
GSE47525	12	6.49	3.23	14	5.32	2.21
GSE48414	154	0.04	0.78	20	-0.25	0.31
GSE51853	126	2.1	0.65	5	2.07	0.17
GSE74190	66	6.96	1.04	44	6.01	0.34
TCGA_LUAD	448	7.94 	0.72 	45	7.31 	1.47 
TCGA_LUSC	336	8.35 	0.78 	44	7.59 	0.58