How to control for covariates of no interest

Hi!

I have two between subjects contrasts: Treat & Sham and two conditions: Pre- & Post-.

I  want to use CONN to do a Time*Group ANOVA and a correlation analysis between clinical changes and functional connectivity changes. The question I have is how to add covariates of no interest (i.e:Age; Baseline clinical scores) into these models.

Thanks a lot!

Liu