[Freesurfer] Can I extract GLM values?

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Dear FS experts,

I have run mris_preproc and mri_glmfit for group analysis as described in the docs. My current project deals with the analysis of cortical thickness of preterm- vs. term-born adults and I want to correlate the difference in cortical thickness between those two groups with gene expression data. Thus, I would need the group difference ROI-wise as values in a spreadsheet/text file to perform correlation lateron. I have used the following code with the --table flag and have used cortical thickness data extracted with aparcstats2table as input.

Is there a way to extract the ROI-wise group difference, corrected for the covariates included into my GLM model?

Best,

Melissa Thalhammer