I'm working with GTEx Adipose- Subcutaneous(v7) and have several missing sample and individual attributes in the GTEx Subcutaneous Adipose, specifically:

Adipose - Subcutaneous=294 samples in the genotype file Adipose - Subcutaneous=294 samples in the expression values

When subsetting the individual attributes file on these 294 I only find: Adipose - Subcutaneous=138 samples in the Sample_Attributes file (phs000424.v7.pht002743.v7.p2.c1.GTEx_Sample_Attributes.GRU.txt)

When subsetting the subject attributes by tissue type I only find: Adipose - Subcutaneous=117 samples in the Subject_Phenotypes file (phs000424.v7.pht002742.v7.p2.c1.GTEx_Subject_Phenotypes.GRU.txt) I am using SMTSD variable for tissue type. Anyone familiar with this possible discrepancy?