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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