Dear CONN users, 

I am a bit limited with my statistical knowledge, and I would really appreciate anyone's advice on how to choose and set a statistical test to answer the following question:
So, I have 2 resting-state scans per subject, one at pre- and one at post-treatment, as well as 2 groups (clinical vs non-clinical), and I would like to know whether the within subject effect (pre vs.post) is greater than the between group effect (clinical vs. non-clinical).

So far we decided to go for a repeated-measures ANOVA and compare the main effect of group vs the main effect of pre-post (simply put, F(pre-post) > F(group)) but no one around me was confident enough to say this is a valid approach or nor say it is not valid... 

Also, please note that I do NOT want to know whether the treatment worked in one group compared to the other, for which, if I understand correctly, I would have to compute a pre-post X group interaction term. 

I would really appreciate any input :)


Best,