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st: [WINDOWS-1252] Simple longitudinal data question ^� drug cont[WINDOWS-1252] inuation rate


From   "Paul O'Brien" <[email protected]>
To   [email protected]
Subject   st: [WINDOWS-1252] Simple longitudinal data question ^� drug cont[WINDOWS-1252] inuation rate
Date   Fri, 5 Oct 2007 01:34:58 +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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