[R-meta] meta-analysis of mean differences with only the difference and its SD

[Martin Lobo]

Hi Gerta.  Thanks.  My question is how to perform the meta analysis having only the difference.  The ones that I have done put the pre and post values, in this I already have the difference.  it would be a single branch.

Than`s again

Lorenzo Martín Lobo MTSAC, FACC, FESC
Especialista Jerarquizado en Cardiología
Jefe de Dpto Enf. Cardiovasculares y Cardiometabolismo Hospital Militar Campo de Mayo.
Jefe de Cardiología Hospital Militar Campo de Mayo
Ex Jefe de Unidad Coronaria Hospital Militar Campo de Mayo
Miembro Titular de la Sociedad Argentina de Cardiología
Fellow American College of Cardiology
Fellow European Society of Cardiology
Ex Miembro del Area de Investigación de la SAC
Ex Director del Consejo de Aterosclerosis y Trombosis de la SAC
Miembro Asesor del Consejo de Aterosclerosis y Trombosis de la SAC
Ex Director del Consejo de Epidemiología y Prevención Cardiovascular de la SAC
Miembro Asesor del Consejo de Epidemiología y Prevención Cardiovascular de la SAC
Experto en Lipidos de la Sociedad Argentina de Lipidos.
Miembro de la Sociedad Argentina de Lipidos.
Instructor de ACLS de la American Heart Association
________________________________
From: Dr. Gerta Rücker <ruecker using imbi.uni-freiburg.de>
Sent: Thursday, September 16, 2021 2:33:48 PM
To: Martin Lobo <mlobo4370 using hotmail.com>; r-sig-meta-analysis using r-project.org <r-sig-meta-analysis using r-project.org>
Subject: Re: [R-meta] meta-analysis of mean differences with only the difference and its SD


Dear Martin,

I don't understand your problem.

- You write you want to do meta-analysis of differences of means. Do you mean pre-post differences? It is not clear.

- You further write you have the difference with its standard deviations, not the initial (pre) or the final (post) values. So, why do you ask how to calculate the difference if you already have it?

Please clarify.

Best,

Gerta

Am 15.09.2021 um 15:23 schrieb Martin Lobo:

Hello everyone,
 I need to do a meta-analysis of differences of means. I have the difference with its standard deviations, I do not have the initial or final values. What method should I use in this case to have only the value of the difference? The generic method of variance?
Thank you




Lorenzo Mart�n Lobo MTSAC, FACC, FESC
Especialista Jerarquizado en Cardiolog�a
Jefe de Dpto Enf. Cardiovasculares y Cardiometabolismo Hospital Militar Campo de Mayo.
Jefe de Cardiolog�a Hospital Militar Campo de Mayo
Ex Jefe de Unidad Coronaria Hospital Militar Campo de Mayo
Miembro Titular de la Sociedad Argentina de Cardiolog�a
Fellow American College of Cardiology
Fellow European Society of Cardiology
Ex Miembro del Area de Investigaci�n de la SAC
Ex Director del Consejo de Aterosclerosis y Trombosis de la SAC
Miembro Asesor del Consejo de Aterosclerosis y Trombosis de la SAC
Ex Director del Consejo de Epidemiolog�a y Prevenci�n Cardiovascular de la SAC

Miembro Asesor del Consejo de Epidemiolog�a y Prevenci�n Cardiovascular de la SAC


Experto en Lipidos de la Sociedad Argentina de Lipidos.
Miembro de la Sociedad Argentina de Lipidos.
Instructor de ACLS de la American Heart Association








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Dr. rer. nat. Gerta Rücker, Dipl.-Math.

Guest Scientist
Institute of Medical Biometry and Statistics,
Faculty of Medicine and Medical Center - University of Freiburg

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