Extract zscores for each vertex in freesurfer

Dear experts,

I would like to correlate the cortical thickness measures with z-scores, vertex-wise (i.e. vertex-to-vertex). I have extracted the cortical thicness measures for each vertex for each subject using the following command:
mris_convert -c lh.thickness lh.orig lh.thickness.asc

This produces an ascii file with cortical thickness stats for each vertex. However, I don’t know how can I get a similar file that would map z-scores for each vertex for each contrast (the z.nii.gz files generated by 1st level in fsfast). Do you have any suggestions how this could be done?

Best regards,

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