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st: Simple longitudinal data question – drug continuation rate


From   "Paul O'Brien" <paul.obrien@afe2.org.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Simple longitudinal data question – drug continuation rate
Date   Fri, 5 Oct 2007 01:57:32 +0100

I have a database of clinic visits with 3 variables, patient_id, datevisit, and drug.

I want to know the number of patients who were prescribed drug ‘microg’ in the first half of 2005 were also prescribed the same drug during a visit in the first half of 2006.

Or is there a better way to calculate the one-year continuation rate?

Patients can make any number of visits.

Thanks,

Paul

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