Help deciding on a research question/statistical test


I was wondering if someone could help me. I have a dataset from a clinical trial which tests the impact of therapy on a group of cannabis users with psychotic symptoms. It's a randomised control trial and 90 participants were assigned to 1 of 3 groups (long therapy/brief therapy/standard care) then their cannabis use and psychotic symptoms measured at baseline and then at follow up.

In my head the most obvious research question is 'is there a difference between baseline and outcome result?' but I've also been given data on how long they've had psychosis and how long they've been a cannabis user and want to see how much of an effect this had on the results if the pre vs post therapy results are significant.

It was my guess to do a MANOVA but reading more about it I'm not too sure if it fits my design.

Thank you!
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