Test for pre vs post measures for multiple groups?

Hi all,

I'm looking to see if there is a significant difference for a numerical measure between 3 groups (healthy, diabetic, diabetic with another disease), before and after a surgery.

Does anyone have an idea of which test would be best to compare pre and post measures between the groups? Also, how would I account for control variables if I wanted to do that?

Thanks in advance for your help!


Active Member
Look into Repeated Measures ANOVA and see if your data satisfy the assumptions. SPSS has a convenient implementation of this method. R is not bad either.


TS Contributor
You can also calculate the pre-post difference and run a 1-way ANOVA on the difference. Use Dunnett's post hoc test to compare differences to the control group.