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Hi, I have a FA images dataset for the Patients + controls groups. I can conduct the regular group wise comparison through the instructions in the TBSS page, but there is no clear instruction to how to add covariates to the comparison. I want to add AGE and GENDER as covariates to see if they have any effect on the significant difference otherwise observed in the FA values in the group comparison without the covariates. Reading through the Forum has not helped me at all. Any guidance will be much appreciated. Regards Aman