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My data takes the following form: Outcome variable = no of suicides (count data) Explanatory variables = Age (grouped into young, middle and old), Gender, Country, Year I am running a Poisson regression. I have been told that I need to take the population size of each country into account, in order to be able to compare no of suicides in different countries. I have now included population in my dataset, and in my regression. What do I do? - How do I interpret the coefficient of Population, or should I ignore this? - Do I need to do anything else? Thank you in advance!