I compared the number of pregnant women receiving specific health service indicators (deliveries, antenatal attendances and malaria prophylaxis uptake) at 14 facilities during three specific time periods; pre, during and after a project intervention; using the pre-intervention data set as the reference in a Poisson regression model, I calculated the Incident rate ratios and their confidence intervals and p-values. I have now been asked to run a test statistic to show whether the data sets pre, during and after the intervention are different or not. Is showing the IRR not enough and is there another test statistic beyond what I have just done?
here is an example of the STATA read out that I obtained on running an analysis. My challenge is in interpreting the print out especially the LR chi2(2) and prob > chi2 results. what do they mean?