Hi Freesurfer experts,

I am looking at the effect of a genetic risk score (GRS) on cortical surface/thickness. I have two groups: patients, controls (male and female).

GroupDescriptorFile 1

Title GRS_all_lh_surf_fwhm10

MeasurementName thickness

Class SexFemaleControl

Class SexMaleControl

Class SexFemalePatient

Class SexMalePatient

I want to include total brain volume and age as covariates. Is this possible using an fsgd file? Is there an example you could give?

Any advice would be great.

Thanking you in advance

Donna