[Freesurfer] mri_segstats --avgwf output question

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Hi there,

I'm running mri_segstats on a collection of clusters resulting from a statistical analysis. My command line usage is as follows:

mri_segstats --i lh.fwhm10.thickness.mgh --avgwf clusterAverages.txt --seg cache.th13abs.sig.ocn.mgh

The results from my statistical analysis in the case of left hemisphere thickness shows 4 clusters that are significant in total, but the clusterAverages.txt contains a total of 5 mean thickness values per subject. This extra value is also reflected in other analyses in my dataset (for other hemisphere and for thickness, area and volume).

Is the extra value listed per subject a global mean of some sort? If so, is it the first column of values or the last?

Thank you, Lara