Hi Alfonso,

I am trying to analyse a simple paired t-test.
I have 31 subjects (experimentals and controls), with 2 sessions (pre and post). In the condition setup, I have associated each session with 1 condition, and in the covariates setup I have introduce one covariate for experimental group and another for controls. But my question is, how could I add a covariate of medication (different values in each session) for analysis in the second-level results?
It would be possible to do only one covariate or one per condition?

Thank you in advance,

Bests,

Olaia