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Dear Prof. Gaser and CAT12 experts

I have the following queries;

1) For between-group comparison of cortical thickness, is it better to
include mean global thickness as a nuisance covariate?

2) If so, how can I obtain mean global thickness for each subject?
According to the manual, I've tried 'Extract ROI Data' --> 'Extract
ROI-based surface values' --> 'ROI analysis', and got several csv files
that contained information regarding the cortical thickness for each
parcellated cortex (i.e., ROI_catROIs_aparc_a2009s_thickness.csv).
However, I cannot find mean global thickness value for each subject.

Thank you in advance for your comments.

LK