Gyrification index for individual regions

I managed to obtain outputs from recon-all lGI – now I would like to obtain a mean gyrification index (not sure if the mean is meaningful?!) for all vertices within 3 ROIs as defined by Destrieux atlas -

How should I do this? Can I treat lGI surfaces just as thockness maps – in which case can I use mri_segstats to obtain mean values?

Cheers
Lena

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