I need to run a survival analysis on my data that contains: Patients stratified by a characteristic and treatment, I want to test if patients survive longer on a specific treatment when they have this characteristic. However, I have a lot of raw data and confounding variables that change over time (Blood pressure, med dosages, etc). I have all of these variable numbers for each patient logged at various points in time during the trial. I want to know what is the optimal way to organize the data so I can run the simplest COX regression analysis on it (if that is even the test I should use) If clarification is needed please let me know
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