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st: epiconf for Cox regression model

Subject   st: epiconf for Cox regression model
Date   Thu, 12 Jun 2008 09:55:56 -0700 (PDT)

Dear Statalisters,

I was wondering if you could help me figure out how to
set up an epiconf command for Cox regression models.
Suppose the model is as follows:

stcox exposure smoke2 smoke3 sex ed_years

and I want to see which potential confounders included
in the model are changing the estimate the most, how
should I set up the epiconf command to match the
hazard ratios I am getting here in the full model. I
tried doing the following but it did not match the
hazard ratio of the exposure in the full model:

epiconf _t exposure smoke2 smoke3 sex ed_years if
_st==1,  con(ed_years) cat(sex smoke2
smoke3)model(cox) backward expos(exposure) dead(_d)

I am getting HRs of 2.70 to 3.00 when I am supposed to
get an adjusted HR of 2.46 and the crude is 2.42. 

Thanks a lot for any help you can provide,



May Baydoun, PhD in Epidemiology (UNC-Chapel Hill)  Staff Scientist,  National Institute on Aging, NIH/IRP,  Biomedical Research Center,  Baltimore, MD

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