I have r-project with meta and metafor packages.
I know how to perform meta-analysis of mean differences but I need to report also the meta-analyzed means (and sd) of the two comparison groups.
Doeas anyone know how to do this?
Have I understood correctly? You are being asked to present the "pooled mean" of each of the two groups, and the "pooled SD" of each of the two groups?
Why do you need to report that? I guess you can do it in the same way that you can get pooled estimates of anything, take the mean from each study, and the standard error (either from the SD and n, or from the confidence interval) and conduct meta-analysis on that. The "pooled SD" could possibly be derived from the within-study variance.
So I think it's easy enough to do, but I'm just not convinced you really need to do it. The mean and SD could be more prone to differences between the study populations chosen, and it's the difference between the means for each study that you need to look at and pool.
I'd be interested in other people's views. Maybe I'm missing something.
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