I am conducting a meta-analysis on the therapeutic benefits of drug A - treated vs placebo. I would like to address the possibility of side effects/tolerability/likeliness of developing side effects. The side effects are categorized into to three subgroups: mild side effects, moderate side effects and severe side effects.
I have included 20 studies in my analysis. I want to visualize the proportion of patients who develop side effects. However, the follow-up time differs among the studies. Some report side effects that occurs within the first month whereas others report side effects first, second and six month. Further, the sample size differs greatly (I do not know it this is relevant).
Can I do some sort of weighted histogram (I don't know if this exist)? Or how can I investigate this matter further/visualize it?