I am working on a meta-analysis of observational studies (basically 39 retrospective papers on different surgical interventions for one condition). I've obtained different weighted proportions (random effects model) through MedCalc for both the full data set and the different subgroups. So far I have only found information on meta-analyses for randomized controlled trials, which I cannot apply to my data since I lack the "control group" in my retrospective papers.
- What is the best statistic method and/or software to use for single-arm, uncontrolled, retrospective studies?
- How I can compare the different proportional mortality ratios of my subgroups?