How to insert a new column in a forest plot - meta-analysis?

Dear,
I want to add an extra column in my forest plot. For example, I have a Column for Author+Year but I need an extra one to include different information such as Country of the studies or diagnosis approaches.

Thanks!
All the best.

Can you show what you have so far? I don't have a lot of experience with forest plots so not sure what exactly is the problem.

Also, I've moved your post to "General" since "meta" is not about meta-analysis, but about meta questions about the forum.

Dear Mishabalyasin,
I have the forest plot of proportion (total positive/total analysed). So in the first column of the graph, I have the Author and year but I want to have an extra column to include information about the country. I am afraid I do not know how to attach images to this message. Please apologise.

All the best.

Are you trying to get something like this?

label <- glue::glue("author {1:6}, {2001:2006}")
mean  <- c(1.29,0.76,2.43,1.68,1.22,1.7) 
lower <- c(0.84,0.50,1.58,1.1,0.8,1.11)
upper <- c(1.95,1.16,3.67,2.54,1.85,2.56)

df <- data.frame(label, mean, lower, upper)

# reverses the factor level ordering for labels after coord_flip()
df$label <- factor(df$label, levels=rev(df$label))

library(ggplot2)
fp <- ggplot(data=df, aes(x=label, y=mean, ymin=lower, ymax=upper)) +
  geom_pointrange() + 
  geom_hline(yintercept=1, lty=2) +  # add a dotted line at x=1 after flip
  coord_flip() +  # flip coordinates (puts labels on y axis)
  xlab("Label") + ylab("Mean (95% CI)") +
  theme_bw()  # use a white background
print(fp)

Created on 2019-03-21 by the reprex package (v0.2.1)

If so, can you put example of your data into the reprex I've posted?
In general, it's much more helpful if you can provide a reprex, since this way we'll solve your problem much more easily. Here is more info here - FAQ: What's a reproducible example (`reprex`) and how do I do one?

Dear,
I am so sorry that I a really new in this. I will che what a replex is. Just in advance here is the script that I use.

prop_MEF <- metaprop(datos$Positive, datos$n, studlab=paste(Author, Year, sep=", "),
data = datos,
sm="PFT",comb.fixed=TRUE, comb.random=FALSE,
method.tau="DL")

forest(prop_MEF,fs.study.labels=7,fs.study=7,ff.study=1, col.study="black",col.inside="black",
fs.hetstat=8,fs.test.overall=8,fontsize=8,spacing=1.1,
fs.heading=8,fs.fixed.labels=8,
xlab= "Proportion Maintaining Adherence (95% CI)",col.diamond.fixed="gray",
xlim= c(0,1))

Which package metaprop and forest functions come from? Can you just add information you need into the studlab=paste(Author, Year, sep=", ")? You already have Author and Year there, so other information can be pasted in as well or are there some problems with that approach.

I do encourage you to take a look at reprex link I gave you. You can share sample of your data with us and it will much easier to help you with this question.

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