Concept: Concurrency
Last Updated: 2005-12-05
Since 193 is higher the finish date is Nov 25th 97 + 32 days, which is Dec 27th 97. So in this example the statin user's duration is from June 17th 1997 to December 27th 1997.
index statin date June 17 1997 last statin date November 25 1997 last day supply 30 days total statin prescriptions 6 total day supply 161 days (Nov 25 - June 17) method 1 duration 161 + (161/5) = 161 + 32.2 = 193 (rounded value) method 2 duration 161 + 30 = 191