[Freesurfer] question about glm setup

Hi,

I am new to freesurfer. I have run reconall on 50 AD subjects. I have also run recon-all -qcache.

So I have the following -

1) Whole brain thickness map for each AD subject 2) age of each subject 3) gender of each subject 4) clinical score of each subject

I DO NOT have control subjects.

I want to run a glm to investigate whether if there is a relation between the clinical score for each subject and their cortical thickness while accounting for age, gender and whole brain average thickness.

Can I use qdec for this ?

This is my first time doing this sort of analysis, so I will be grateful if I can get some step-by-step help.

Thank you very much

Subha