I would like to work on a meta analysis project, I have kept 8 studies that satisfy my criteria and I'd like to continue with these. Their results are formed as odds ratios (OR) and confidence intervals (CI).
I read that I should convert them into log values and estimate the standard errors. I did this, but I don't know how to continue since all examples that I have seen are about trials and provide the accurate numbers of outcomes (i.e. before treatment, after treatment, or death/alive, etc) while I have only ORs and CIs.
Could anyone help me please? Please propose also a free software, capable of analyzing ORs and CIs. Many thanks!