[Freesurfer] 2x3 ANOVA question

Hi all, I am trying to run 2x3 factorial model correcting for age, sex and intracranial volume. Just to give you insight in my data I have my fsgd file as

GroupDescriptorFile 1 Title DOSS analysis 2x3 factorial Class MaleGroup1Low

Class MaleGroup1Medium Class MaleGroup1High Class MaleGroup2Low Class MaleGroup2Medium Class MaleGroup2HighClass FemaleGroup1Low

Class FemaleGroup1Medium Class FemaleGroup1High Class FemaleGroup2Low Class FemaleGroup2Medium Class FemaleGroup2High Variables Age normVol Input SUB001 MaleGroup1Low 18 0.4

And also my contrast files as

Group1Group2.mtx [1 1 1 -1 -1 -1 1 1 1 -1 -1 -1]/3

MainEffectState.mtx 0.5 -0.5 0 0.5 -0.5 0 0.5 -0.5 0 0.5 -0.5 0 0 0.5 -0.5 0 0.5 -0.5 0 0.5 -0.5 0 0.5 -0.5

HighvLow.mtx -0.5 0 0.5 -0.5 0 0.5 -0.5 0 0.5 -0.5 0 0.5 HighvMed.mtx 0 -0.5 0.5 0 -0.5 0.5 0 -0.5 0.5 0 -0.5 0.5

GroupxState-interaction.mtx 0.5 -0.5 0 -0.5 0 0.5 0.5 -0.5 0 -0.5 0 0.5 0.5 0 -0.5 -0.5 0 0.5 0.5 0 -0.5 -0.5 0 0.5

I'd appreciate if anyone could please let me know that my design is correct.

Thanks for help.

-Sabin