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st: RE: Calculating a pooled odds ratio from an adjusted odds ratio?


From   Marcos Vinicius <bioestatistico@inbox.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: RE: Calculating a pooled odds ratio from an adjusted odds ratio?
Date   Tue, 1 Oct 2013 10:56:08 -0800

Hello,
.. for meta-analysis of unadjusted OR I know the syntax but and for adjusted odds ratio ?
How to conduct using stata?
Thanks Vinicius.

use bcgtrial.dta, clear
list trialnam startyr tcases tnoncases ccases cnoncases , clean noob abbr(10)




metan tcases tnoncases ccases cnoncases, rr fixedi lcols(trialnam startyr) xlabel(0.1,10) favours(BCG reduces risk of TB # BCG increases risk of TB)




gen logRR = ln( (tcases /ttotal )/(ccases /ctotal ))
gen selogRR = sqrt(1/tcases +1/ccases -1/ttotal -1/ctotal )
metan logRR selogRR , fixed eform nograph


for meta-analysis of unadjusted 

metan logRR selogRR , fixed eform
metan logor selogor , eform fixed label(namevare=trialnam, yearvar=startyr ) xlabel(.1,.5,1,2,10) force effect("Odds ratio")

> -----Original Message-----
> From: bioestatistico@inbox.com
> Sent: Mon, 30 Sep 2013 10:11:29 -0800
> To: statalist@hsphsun2.harvard.edu
> Subject: Calculating a pooled odds ratio from an adjusted odds ratio?
> 
> Hello,
> I have individual adjusted odds ratios from different observational
> studies, and I want to combine them to calculate a pooled odds ratio,
> So, is there any formula or guidance on how to combine them  ?  (stata
> code?)
> The book(and others classical references) Meta-Analysis in Stata: An
> Updated Collection from the Stata Journal don’t mention it
> Any help would be greatly appreciated.
> Regards,
> Vinicius,
> 
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