Hi there!

I have some data where some subjects has two or three different responses and events. I want to test an association between the age and gender of subjects and the outcome of interest but I'm having a problem with duplicated demographic data. For example, subject 2 had adverse event A with drug X and subject 2 had also adverse event A with drug Y, and then did not experience A with drug Z. If I want to correlate A to the age and gender of patients, what should i do? is there a way to give a weight to the multiple observations from the same patient? (subject 2 would have his demographic data repeated 3 times in the data set) Or there is no problem with duplicated baseline data?

Thanks in advance!

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