Dear Statalisters
I have a longitudinal dataset with three groups (exposed group, sibling control, community control) and data was collected at two time points (baseline and endline). I want to see how a biomarker changes between the time points across groups adjusted for age, gender weight and height. I intended to do linear mixed model followed by the margins command. I am not sure what estimate to use as my adjusted mean difference when presenting the results; should I use the coefficient from the mixed model or the margins from margins command. Or how do I marry the mixed model output with margins output.

Thanks,
Oscar