I have pre/post data where all subjects underwent the intervention. The outcome is a score. I am also looking to stratify my analysis by gender. I understand I can stratify my paired t-test in SAS via a simple class statement, but how do I determine if the difference between the genders are significant? I would normally use an interaction for this but given the data is paired and I am using a t-test, i am not sure how to test the significance of the difference.