<http://www.talkstats.com/threads/interaction-of-treatment-with-confounder.77853/>
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"In a multivariate regression analysis, I examine the effect that a treatment method has on subjects' hemoglobin levels. Since this is a retrospective study, I could not control for gender (or age) by randomization prior to collection. As a result, I control for gender in my analyses. The treatment effect remains significant even when I control for gender. However, when I include an interaction term between gender and treatment, the treatment effect is no longer significant. However, the interaction term is significant. Unfortunately, I don't know what to conclude from this. Whether I should report the interaction and what exactly it means in that case. Hopefully, someone could help me with this, thank you!\n\nGeschlecht means Gender, Gruppen_Zwei is the treatment and HB_postop is the hemoglobin level."
<https://talkstats.com/threads/interaction-of-treatment-with-confounder.77853/#post-230980>