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st: confidence limits of survival difference


From   Giulio Rizzoli <giulio.rizzoli@unipd.it>
To   statalist@hsphsun2.harvard.edu
Subject   st: confidence limits of survival difference
Date   Tue, 25 Feb 2003 18:56:07 +0100

Dear experts I have these medical data.
that i have pooled from the literature. They concern survival of 
medical devices biologic or mechanic. 
at-risk are the unit at risk.
Survival are the % in use at stated time.

Time	at-risk-bio at-risk-mec	Survival-bio Survival-mec
0	477	391	100	100	 
1	362	286	86.5	86.9
5	249  186	73.6	73.5
10	94	84	62	60.2	
15	29	22	46.7	47.8	

I would like to know if it is possible and how to calculate
the 95% Confidence Interval of the Survival difference.
   Many thanks 
   Giulio Rizzoli

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