[Freesurfer] interpreting file (cache.th13.abs.y.ocn.dat) from longitudinal vertex-wise analysis

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Hi FreeSurfer team,

After running longitudinal FS, and running mri_glmfit using files that measured spc, we found clusters associated with our continuous variable (WMH volume) after controlling for other covariates. I was wondering though, do the values found in cache.th13.abs.y.ocn.dat reflect the change in thickness (as measured by spc) for each subject of the cluster found to be significantly associated? I read other posts that it was a value of thickness of each cluster, but I wasn't sure if the same was true for a longitudinal analysis (spc), as the file contains both positive and negative numbers.

Thanks so much for your help! Batool