Hello, I need help with meta-analysis. I want meta-analyze data from studies regarding histological features of a series of disease (A,B,C,D..). Fo this, do I need to create a table for every features for every disease?The aim of the work is to obtain the most frequent histological characteristics of every disease. Collected data are collected from studies in which control groups are different. For this, in the table for the meta-analysis, who are controls?Please,help me!