Dear Experts,

I'm looking at differences in area between two groups of subjects in FreeSurfer using qdec.

I've delineated an ROI based on a cluster that showed significant differences in surface area between the two groups (taking gender into account, and with age and ICV as nuisance covariates). 

As a sanity check, I extracted the total surface area values for that ROI for each subject in native space (using mri_label2label and mris_anatomical_stats)

When I plot these values (and do an ANCOVA with the same covariates, or even just a simple t-test) there is almost no difference between the groups. Did I do something wrong? How do I get the average surface area values for each subject (in that ROI that shows a difference) so I can see the spread of values in each group?

Thanks,

Siti