Simple question here. Suppose that I have 20 papers to be included in a meta-analysis, which compare the risk of death with 2 treatments, A vs. B. For 15 of them, I only have number of events and number of patients in both groups (A vs. B). For the other 5, I do not have the number of events/patients in group, but I have instead an adjusted HR/OR.
How can I pool together these two type of effect size (i.e., event count and HRs/ORs) into one meta-analysis with metafor?
My guess is that I can compute logOR and SE in the first place for those studies for which I have event count, and then pool together with the other pre-computed effect size (aOR, or aHR), but I am unsure whether this is suitable. Besides, I'm pretty aware that OR and HR are not interchangeable, so that caution should be use when pooling different effect measures.
Moreover, I was wondering if there is some straigthforward option/function to do this in the package.
Thank you in advance to anyone who want to make a guess.