1   tissue          GTEx tissue name
2   geneId          GTEx gene ID (GENCODE v26)
3   Meff            effective number of independent variants tested for association with the gene (calculated by eigenMT)
4   snpId           GTEx variant ID
5   F_snp           pseudo-F statistic corresponding to the variant (main effect)
6   F_pop           pseudo-F statistic corresponding to the population (main effect)
7   F_snpXpop       pseudo-F statistic corresponding to the variant:population interaction
8   pv_snp          P-value of association (asymptotic PERMANOVA) corresponding to the variant
9   pv_pop          P-value of association (asymptotic PERMANOVA) corresponding to the population
10  pv_snpXpop      P-value of association (asymptotic PERMANOVA) corresponding to the variant:population interaction
11  nb.groups       number of genotype groups at the variant
12  md_snp          maximum difference in adjusted relative expression between genotype groups (overall)
13  tr.first_snp    transcript ID of the first out of two transcripts changing the most, in opposite directions, due to the variant main effect
14  tr.second_snp   transcript ID of the second out of two transcripts changing the most, in opposite directions, due to the variant main effect 
15  md_EA           maximum difference in adjusted relative expression between genotype groups (for European Americans, EA)
16  md_AA           maximum difference in adjusted relative expression between genotype groups (for African Americans, AA)
17  tr.agree        degree of agreement between the two transcripts that change the most in EA and AA (takes values of 0, 1 or 2)
18  info_snp        number of individuals in each genotype group at the variant, including missing values (i.e. -1, 0, 1, 2)
19  info_pop        number of individuals in each population (EA, AA)
20  info_snpXpop    number of individuals in each level of the variant:population interaction
21  F.svQTL         svQTL test statistic (variant:population interaction)
22  nb.perms.svQTL  number of permutations for the svQTL test (variant:population interaction)
23  pv.svQTL        svQTL test P-value (variant:population interaction)
