Dear Freesurfer group

I want to get cortical thickness, and I am confused between using these two command lines:

mris_anatomical_stats -t subjid/surf/lh.thickness -b subjid lh 

that gives following information

    number of vertices

    total surface area (mm^2)

    total gray matter volume (mm^3)

    average cortical thickness +- standard deviation (mm)

    integrated rectified mean curvature

    integrated rectified Gaussian curvature

    folding index

    intrinsic curvature index

    structure name

110852  71971      0  0.000 0.000     0.168     0.133     5368   529.3  /Users/christine/Result_FS_Corrected/N219c/surf/lh.white

and 

mris_anatomical_stats -t subjid/label/lh.cortex.label -b subjid lh

that gives following information

    number of vertices

    total surface area (mm^2)

    total gray matter volume (mm^3)

    average cortical thickness +- standard deviation (mm)

    integrated rectified mean curvature

    integrated rectified Gaussian curvature

    folding index

    intrinsic curvature index

    structure name

110852  71971      0  0.000 0.000     0.168     0.133     5368   529.3  /Users/christine/Result_FS_Corrected/N219c/surf/lh.white.

Can you please guide me which one is the right one for measuring cortical thickness?

Why for both of them (mean+-STD) is zero?

Thanks in advance.

Best Regards

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Nooshin N. Zadeh
Graduate Assistant

Departments of Electrical Engineering and Neurology

University of Miami