When you extract volumetric info for a structure (e.g., fslstats output_name_all_fast_firstseg -l 16.5 -u 17.5 –V) and then run between-group comparisons using a different software package (e.g., matlab) do you need to include total GM volume as a covariate or is this somehow accounted for in the segmentation and registration process that is run as part of run_first_all? Thanks!
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