[Freesurfer] mri_glmfit | constructing the "C.txt" and FSGD files

Hi all,

I'm trying to run what should be a very simple cortical thickness regression analysis in mri_glmfit, but could use some help with putting together my "C.txt" and FSGD files. I have two classes (e.g. Patient, Control) and two nuisance variables (i.e. Age, Gender).

My FSGD file looks like this: GroupDescriptorFile 1 Title FS_Thickness Class Patient Class Control Variables Age Gender Input 130725_GB49NP Patient 18 1 Input 130620_HU64KP Patient 21 2 ...

And my "C.txt" file looks like: 1 -1 0 0 0 0 ...which I'm pretty sure is wrong, but I don't quite understand what the columns mean, so any light shed would be appreciated!

-Justin