Hello FreeSurfer Experts,
I am trying to run a contrast comparing 3 different classes, and using one covariate as follows (truncated for simplicity's sake!):
GroupDescriptorFile 1 Title CTA TMD Patients Low vs Patient High vs Controls Class Control plus blue Class Patient_Low circle green Class Patient_High cross red Variables Age Input c3 Control 25 Input c4 Control 27 .. .. .. Input p1 Patient_Low 22 Input p2 Patient_Low 20 .. .. .. Input p12 Patient_High 50 Input p13 Patient_High 59 Input p14 Patient_High 18
I was wondering how I can 1) Compare cortical thickness between the 3 groups, using the variable as a covariate of no interest and, subsequently, compare between the age slopes of the 3 classes.
Any (and all) help is greatly appreciated.
Regards,
Massieh Moayedi PhD Student Institute of Medical Science University of Toronto
Department of Brain, Imaging and Behaviour- Systems Neurosciene Toronto Western Research Institute University Health Network