Hello Alfonso,

I'm following up on this post because I have a question about controlling for age within a single group of patients in a seed to voxel analysis. What I have done so far is to include the following contrast: Group, Age [1,0]. However, I noticed that nearly all the effects I observed without controlling for age disappear. I wanted to ask if this approach is correct, or if it would be better to use another strategy or not control for age at all?

Thank you, 

Valentina