Hi Mark,

Have a look in R code at

https://rdrr.io/search?q=metamean&package=meta&repo=cran

and

https://www.rdocumentation.org/packages/meta/versions/4.9-6/topics/metamean

and

https://cran.r-project.org/web/packages/meta/meta.pdf

Maybe it will get you on track for your statistical analysis.

Cheers

Frank

Thanks Frank, I did have a look at this page some time ago, but this time I found this section which I hope might be what I am looking for...

\subsection{Subgroup analysis}{ #' #' Argument \code{subgroup} can be used to conduct subgroup analysis for #' a categorical covariate. The \code{\link{metareg}} function can be #' used instead for more than one categorical covariate or continuous #' covariates. #' }