Apologies if this is a very basic question.  But it has been awhile since I've run a model with an interaction term and I want to make sure I am interpreting things correctly.  I saw a similar question was asked recently so apologies if this is duplicative but I still wasn't sure I 100% understood the interpretations there.   This is from a proc genmod model.  In the first two tables it shows the interaction term is non-significant.  But in the  differences table there do appear to be some strata that are statistically significant while others are not.  Would I still use the main maximum likelihood tables to conclude there was no interaction?  If there was interaction would I expect to see more differences between the strata effect estimates in the least square model (i.e. 95% CIs not overlap)?  Or am I supposed to look at the differences table and conclude there is some kind of interaction going on?   Also is there way to get just an overall relative risk measure for the interaction term?  Or is that not of any use?  In my write up of testing for significance of the interaction do I just cite the p-value?  (the other effect estimates included for other analyses are relative risks).                 ... View more