External Email - Use Caution Dear FreeSurfer experts,
I am currently running longitudinal analyses using the paired analysis tutorial for two time points. There are two tests I am trying to run: 1. Calculating significant changes in volume between the two time points, controlling for age and gender. 2. Correlating BMI with change in volume between the two time points, controlling for age and gender. For (1), would it be necessary to demean age for a one-sample longitudinal analysis? And for (2), would I need to demean both BMI and age? Thank you for your help.
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