[Freesurfer] mean thickness covariate, mean area covariate, & mri_anatomical_stats for multiple subjects

Hello freesurfers,

It appears that prior discussions on the listserv have recommended using mean cortical thickness (rather than ICV) as a covariate for thickness analyses (predominantly recommended by Michael Harms). I have three questions about this:

1. Is there a paper that I could cite that recommends using mean cortical thickness rather than ICV? 2. Would the same logic be applied to surface area analyses? i.e. would it make more sense to use mean surface area as a covariate in surface area analyses? If so, which mean surface area calculation should be used? mri_anatomical_stats can produce both pial and white matter mean surface area stats. 3. Is there a way to run mri_anatomical_stats on multiple subjects at once and write to a tablefile (similar to asegstats2table output)?

Thanks!

Laura.