I need your help. I have conducted a study with three intervention and one control group. Now, I want to analyze the (ordinal scale) data for pre-post effects.

What do you think, which test would be appropriate here?

I have thought about the Friedman test since there are more than two dependent groups and the data is ordinal. However, I am not sure how exactly to conduct the Friedman test in this case since I have three intervention and 1 control group. So not all the data is paired, it's just the pre-post results.

Should I conduct a Wilcoxon matched pair sign test for every group separately and would i need to perform for example a bonferroni correction in this case?

I am interested in your thoughts about this.

Thank you