Hi @mmkaz : OK. Using the Distribution platform, put Side Effect B in for Y as shown below.
Then click on the red triangle and choose choose "Confidence Interval" as shown below (I selected 95%).
You will the get a confidence interval for each (as shown below)
In this example case, 55% of this sample of 200 patients did not experience this side effect. The 95% CI is 48.1% to 61.7%. This basically means that in the entire population of patients (what you are really interested in), the percent who do not experience this side effect could be as low as 48.1% and as high as 61.7% (with 95% confidence).
You don't need to look at both Levels (since %Present = 100 - %Absent) . Pick the Level of interest and focus there.
Questions? Come back,