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st: AW: Meta-analysis pooling relative risk from relative risks possible?


From   "Trelle Sven" <strelle@ctu.unibe.ch>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Meta-analysis pooling relative risk from relative risks possible?
Date   Thu, 16 Feb 2012 11:36:57 +0100

You will need to log-transform the RR and the corresponding confidence interval (e.g. gen newvar = ln(RR)). Then metan from ssc (ssc install metan) should do the job. 

If not, you will need to approximate the standard error from the log transformed confidence interval: 

se=(uci-lci)/3.92 (should be reasonable in most situations but you have to judge this by yourself)

se = standard error of logRR
uci = upper confidence interval (log transformed)
lci = lower ...

Do not forget to use the eform option.

Best
Sven

> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] Im Auftrag von Sofia Ramiro
> Gesendet: Donnerstag, 16. Februar 2012 09:14
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: Meta-analysis pooling relative risk from relative risks possible?
> 
> 
> Dear all,
> 
> I would like to ask your help for the following: I would like to perform a meta-
> analysis of some studies. However, I do not have the raw data to fill in the
> 2X2 table. I have a Relative Risk (and correspondent 95%CI) for each study. Is
> it possible to pool these RR and get a pooled estimate? If yes, how?
> I have been searching online for this information, but haven't been
> successful...
> 
> Thank you!
> 
> Sofia
> 
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