Hi you helpful people.

I have measured a concentration of a medical drug 1 week after operation in 225 patients randomized to 2 groups. Group B recieving an additional drug, that might affect the concentration of the measured drug.

I have presented the concentrations in a dotplot.
What would be the best way to test for siginficance and to present the p-values and confidence intervals for this?

Code:
dotplot Concentration, over(Randomization) center mean, if Baseline==1 & Dose==2000
kdensity Concentration if Baseline==1 & Dose==2000, norm
qnorm Concentration if Baseline==1 & Dose==2000
pnorm Concentration if Baseline==1 & Dose==2000
Here are the above graphs:

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