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Re: st: Including age as covariate or using age-stratified estimates in stcox


From   raoul reulen <r.c.reulen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Including age as covariate or using age-stratified estimates in stcox
Date   Fri, 1 Oct 2010 09:24:24 +0100

Roland,

Do you mean attained age or age at appendectomy? I suspect that the
proportional hazard assumption was not satisfied for age. Did you
check for this?

Raoul

On 1 October 2010 07:00, roland andersson <rolandersson@gmail.com> wrote:
> I am analysing cause-specific mortality after appendectomy. Mortality
> is strongly related to age as is exposure to different morbidities.
> The hazard therefore varies according to age. I get substantially
> different results if I use stcox with strata(age) or include age and
> age2 as covariates. Can you help me understand the difference and the
> correct use of stratified anlysis versus including the variables as
> covariates.
>
> Roland Andersson, MD, PhD
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