[R-meta] Fwd: Question on Umbrella review and other types

Michael Dewey ||@t@ @end|ng |rom dewey@myzen@co@uk
Tue Apr 23 13:04:41 CEST 2024 

If you are going to update the review I suggest best practice is to redo 
the search as otherwise you are importain any biases introduced by the 
authors of the previous reviews.

Michael

On 22/04/2024 19:45, Im wrote:
> 
> Dear All!
> Many thanks indeed for your much valuable replies.
> 
> My research is based on "Prognosis in relation to age in a carcinoma".
> The study results are "young age patients have better prognosis", "old 
> age have worst prognosis", "age has not affect on prognostication" etc....
> Is it possible to be selective in the studies in terms of time 
> of studies published etc., so that there can be some change in the 
> analysis than previous ones ?
> 
> With such a trivial number (only two) of previous SRMA, it seems better 
> to conduct a new SRMA instead. But I am bit concerned whether it is Ok 
> to conduct a new SRMA when the previously SRMA have been published with 
> a gap of just couple of years (2020 and 2021)?
> 
> So, if there is no problem in conducting a new SRMA, then I would be add 
> the studies and proceed with the routine "meta" package in R studios for 
> forest plots and funnel plots ?
> 
> best regards,
> Imran
> 
> On Mon, Apr 22, 2024 at 6:35 PM Dr. Gerta Rücker via R-sig-meta-analysis 
> <r-sig-meta-analysis using r-project.org 
> <mailto:r-sig-meta-analysis using r-project.org>> wrote:
> 
>     Yes,I have noted that the word "umbrella" has experienced a change
>     of meaning over the last years. In former times (that is, before
>     network meta-analysis became popular) it meant to conduct a number
>     of pairwise meta-analyses for different treatments for the same
>     condition in the same review. Since this is now better done using
>     network meta-analysis, they now use the term for something
>     different, namely overview of overviews, and this is what the
>     original poster meant.
> 
>     As I understand, in the described situation, a re-analysis is
>     planned, thus I am not sure whether a special R package is needed.
> 
>     Best,
>     Gerta
> 
>     UNIVERSITÄTSKLINIKUM FREIBURG
>     Institute for Medical Biometry and Statistics
> 
>     Dr. Gerta Rücker
>     Guest Scientist
> 
>     Stefan-Meier-Straße 26 · 79104 Freiburg
>     gerta.ruecker using uniklinik-freiburg.de
>     <mailto:gerta.ruecker using uniklinik-freiburg.de>
> 
>     https://www.uniklinik-freiburg.de/imbi-en/employees.html?imbiuser=ruecker <https://www.uniklinik-freiburg.de/imbi-en/employees.html?imbiuser=ruecker>
> 
> 
>     -----Ursprüngliche Nachricht-----
>     Von: Michael Dewey <lists using dewey.myzen.co.uk
>     <mailto:lists using dewey.myzen.co.uk>>
>     Gesendet: Montag, 22. April 2024 17:23
>     An: R Special Interest Group for Meta-Analysis
>     <r-sig-meta-analysis using r-project.org
>     <mailto:r-sig-meta-analysis using r-project.org>>
>     Cc: Dr. Gerta Rücker <gerta.ruecker using uniklinik-freiburg.de
>     <mailto:gerta.ruecker using uniklinik-freiburg.de>>
>     Betreff: Re: [R-meta] Fwd: Question on Umbrella review and other types
> 
>     There is a package https://cran.r-project.org/package=metaumbrella
>     <https://cran.r-project.org/package=metaumbrella> on
>     CRAN which performs umbrella reviews. Whether what they mean by
>     umbrella
>     is what you mean is open to question.
> 
>     Michael
> 
>     On 22/04/2024 15:44, Dr. Gerta Rücker via R-sig-meta-analysis wrote:
>      > Hi (whoever you are),
>      >
>      > If you want to repeat the old meta-analysis anyway, assuming that
>     all studies adhere to some common well-defined inclusion criteria, 
>     then why not conducting a meta-analysis including the union of all
>     studies included in the two older reviews and the new studies? This
>     would simply be an updated review, not necessarily an umbrella review.
>      >
>      > Best,
>      > Gerta
>      >
>      >
>      > UNIVERSITÄTSKLINIKUM FREIBURG
>      > Institute for Medical Biometry and Statistics
>      >
>      > Dr. Gerta Rücker
>      > Guest Scientist
>      >
>      > Stefan-Meier-Straße 26 · 79104 Freiburg
>      > gerta.ruecker using uniklinik-freiburg.de
>     <mailto:gerta.ruecker using uniklinik-freiburg.de>
>      >
>      >
>     https://www.uniklinik-freiburg.de/imbi-en/employees.html?imbiuser=ruecker <https://www.uniklinik-freiburg.de/imbi-en/employees.html?imbiuser=ruecker>
>      >
>      > -----Ursprüngliche Nachricht-----
>      > Von: Im via R-sig-meta-analysis
>     <r-sig-meta-analysis using r-project.org
>     <mailto:r-sig-meta-analysis using r-project.org>>
>      > Gesendet: Montag, 22. April 2024 15:47
>      > An: r-sig-meta-analysis using r-project.org
>     <mailto:r-sig-meta-analysis using r-project.org>
>      > Cc: Im <aligners79 using gmail.com <mailto:aligners79 using gmail.com>>
>      > Betreff: [R-meta] Fwd: Question on Umbrella review and other types
>      >
>      > ---------- Forwarded message ---------
>      > From: Im <aligners79 using gmail.com <mailto:aligners79 using gmail.com>>
>      > Date: Mon, Apr 22, 2024 at 12:56 PM
>      > Subject: Question on Umbrella review and other types
>      > To: <r-sig-meta-analysis using r-project.org
>     <mailto:r-sig-meta-analysis using r-project.org>>
>      >
>      >
>      >
>      > Hello!
>      >   I am planning to do an Umbrella review.
>      >
>      > The number of systematic/meta analysis are two. Rest of the
>     studies are 3-4
>      > new studies published after or almost at same time of these two
>     reviews.
>      >
>      > My question is can I conduct the Umbrella review ? If not then is
>     there any
>      > other type of review that could be performed ?  I want to include the
>      > previous systematic/meta reviews. I also plan to repeat already
>     performed
>      > meta-analysis. Can I add the meta analysis studies HRs and new
>     studies to
>      > make another meta-analysis ?
>      >
>      > Please guide me which review could be the best in this situation.
>      > best regards
>      >
>      >       [[alternative HTML version deleted]]
>      >
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> 
>     -- 
>     Michael
>     _______________________________________________
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-- 
Michael

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