Dear Doug, 

I have read this post(https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg25218.html) regarding extracting Mean Cth of each hemisphere and I just get insula as the last and totally 34 numbers, I use 

aparcstats2table --hemi lh --subjects bert -m thickness --tablefile lh.Cth.bert.txt