# Meta-analysis in R without control group? Purely improvement of symptoms

I’m currently trying to perform a meta-analysis in R via the metafor package using data that does not have a control group. In this case, I am looking to see whether or not a type of surgical intervention improves symptoms in these unique type of patients. Essentially, the only data I have from these studies is whether symptoms of their certain pain has improved.

Would this be a meta-analysis of proportions? Or would I do a standard REML in metafor: For example, one paper gives the data that 20/25 patients had symptoms that improved. Thus, would I have 4 data points, “creating” my own control group?:

1. Surgery_improvement: 20 patients
2. Surgery_no_improvement: 5 patients
3. No_surgery_improvement: 0 patients (obviously, as this doesn’t even exist)
4. No_surgery_no_improvement: 25 patients

And then perform a standard meta-analysis?