<div dir="ltr">Dear Gerta,<div>Thanks for your response. I also realized that most of the time papers do not report the pre-treatment and/or the pre-control values. Sometimes they just say that the values are not different but do not report thoses, but more often they do not measure it at all. Is there any way to take this into account?...I am not sure about how to deal with presence vs. absence of such values in the meta-analysis or whether this just needs to be discussed as a potential limitation.<div>Thanks a lot for your response.</div><div>Gladys</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le jeu. 28 janv. 2021 à 12:35, Dr. Gerta Rücker <<a href="mailto:ruecker@imbi.uni-freiburg.de">ruecker@imbi.uni-freiburg.de</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Dear Gladys,</p>
<p>An obvious approach would be to take the post values (or,
equivalently, the change scores) as an outcome, and the baseline
values as a covariate in a metaregression model.</p>
<p>Best,</p>
<p>Gerta<br>
</p>
<div>Am 28.01.2021 um 10:49 schrieb Gladys
Barragan-Jason:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Dear all,
<div>I would like to know how to take the baseline difference
into account in meta-analysis of the impact of a treatment on
experimental data in which the baseline of the control group
is different from the baseline of the treatment.</div>
<div>For now, I am using the post- means and SD of the control
and the treatment group (and the <a href="http://rma.mv" target="_blank">rma.mv</a> function) and also the
pre-post values of the treatment group but I don't think this
is correct and I am not sure how to proceed.</div>
<div>Any advice?</div>
<div>Thanks a lot in advance.</div>
<div>Best regards,</div>
<div>Gladys<br clear="all">
<div><br>
</div>
-- <br>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">------------------------------------------</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">Gladys
Barragan-Jason, PhD. </span><a href="https://sites.google.com/view/gladysbarraganjason/home" style="font-family:Tahoma,sans-serif" target="_blank"> Website</a></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">Station
d'Ecologie Théorique et Expérimentale (SETE)</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">CNRS
de Moulis</span></p>
<div>
<p class="MsoNormal"><span style="color:black"><img style="width: 1.3854in; height: 0.8437in;" alt="image.png" width="133" height="81" border="0"><img style="width: 0.625in; height: 0.625in;" alt="image.png" width="60" height="60" border="0"></span></p>
</div>
<br>
<br>
<p class="MsoNormal"><span style="font-family:Tahoma,sans-serif" lang="EN-GB"> </span></p>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
R-sig-meta-analysis mailing list
<a href="mailto:R-sig-meta-analysis@r-project.org" target="_blank">R-sig-meta-analysis@r-project.org</a>
<a href="https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis" target="_blank">https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis</a>
</pre>
</blockquote>
</div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">------------------------------------------</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">Gladys Barragan-Jason, PhD. <u></u><u></u></span><a href="https://sites.google.com/view/gladysbarraganjason/home" style="font-family:Tahoma,sans-serif" target="_blank"> Website</a></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">Station d'Ecologie Théorique et Expérimentale (SETE)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Cambria,serif;color:black">CNRS de Moulis<u></u><u></u></span></p>
<div>
<p class="MsoNormal"><span style="color:black"><img border="0" width="133" height="81" style="width: 1.3854in; height: 0.8437in;" src="cid:image003.png@01D62ED8.BF1FBC30" alt="image.png"><img border="0" width="60" height="60" style="width: 0.625in; height: 0.625in;" src="cid:image004.png@01D62ED8.BF1FBC30" alt="image.png"><u></u><u></u></span></p>
</div>
<br>
<br>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Tahoma,sans-serif"> </span></p></div></div></div></div>