Thank you. In the meantime I tried stset endage, enter(time begage) failure(died==1)and
obtained almost identical results. I am trying to figure out why.
UG
-----------------------------------
-----Original Message-----
From: owner-[email protected]
[mailto:owner-[email protected]]
On Behalf Of Svend Juul
Sent: Sunday, September 07, 2008 10:21 AM
To: [email protected]
Subject: Re: st: AGE at event occurrence as the time variable in mortality
analysis rather than time between entry into follow up an event occurrence
Uri wrote:
In an epidemiological study where we follow up very
old individuals the
importance of time till event (say, mortality) pales
in comparison to the
actual age of the individual when the endpoint event
occurred. Using stcox
(for example) we would seek to estimate the event
hazard ratios associated
with several predictors. In a cohort which spans over
a meaningful age range
the age when the event occurs rather than how long it
took to occur since
that person entered follow up which will matter. So
instead of the later the
better we would like to say the older the better.
What is the accurate way to stset the data so that age
at event(assuming of
course it is included for each event) become the time
variable?
===============================================================
You can make age the time axis:
stset endage , enter(time begage) failure(died==1)
id(id)
where -begage- is the age at entry and -endage- the
age at death
or censoring.
hth
Svend
________________________________________________________
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute
of Public Health,
Department of Epidemiology)
Vennelyst
Boulevard 6
DK-8000 Aarhus C, Denmark
Phone, work: +45 8942 6090
Phone, home: +45 8693 7796
Fax: +45 8613 1580
E-mail: [email protected]
_________________________________________________________
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