Thanks for taking the time to read my question. Apologies in advance for the likely basic nature of my question (its been a few years since Ive done any proper statistics).

In short, Im in the process of writing a book about the various treatments for Crohn's Disease, and Im looking for a way to summarize the treatment effects of various studies. As an example, a bunch of studies compare Remicade to placebo and each give summary statistics like: "60% of patients receiving Remicade went into remission vs 20% in controls at week 4". Whats the best way to combine the treatment effects of a number of studies like this to give the reader a rough idea of the "true" treatment effect?

Thanks for the help!