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st: Comparing cumulated incidence of a cohort with the general population


From   "roland andersson" <rolandersson@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Comparing cumulated incidence of a cohort with the general population
Date   Thu, 22 Nov 2007 22:29:26 +0100

I am studying the risk of small bowel cancer and carcinoid in a cohort
of patients with Crohn's disease. I have calculated SIR compared with
the genral population. I would also like to calculate and show
graphically the cumulated risk of small bowel cancer in the cohort (a
KM-plot) in comparison with the risk in the general population. Is it
possible to construct a KM-plot from the incidence rates from the age-
and period-bands? I am considering to create a "virtual matched
cohort" and calculate the cumulated risk from the age- and period-band
incidence rates for each virtual individual. Any hints on how this can
be done? Or are there any accepted methods for this kind of analyses?

Regards
Roland Andersson
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