sorry, I am STATA beginner, and I cannot find a solution for a probably very easy question:

I have 38 patients who had side effects after a medication and 38 matches who did not. I have 3 lab parameters: CRP, Leukozytes and PCT for each of them; I want to box CRP1 for those who had side effects next to CRP2 for those who did not, Leukozytes1, Leukozytes2, PCT1 and PCT2; so there are always 2 bars that belong together; when I do

graph box CRP1 CRP2 Leukozytes1 Leukozytes2 PCT1 PCT2

all bars have the same gap; but I want to have wider gaps between CRP2/Leukozytes 1 AND Leukoyztes2/PCT1.

Can anybody help? I am googling for hours... must be something to do with the over() option...