I am working on a systematic review and at the stage of appraising selected literature, which is mostly nonrandomised. I find the ROBINS-I appraisal tool to be relevant. After reading the 53 paged guideline and the 11 page tool I am finding it a bit complex. Before I give it up I would appreciate tips from those that have previously used it and your experience.
There might be others less complex, any recommendations will be grately appreciated.
Thanks, Nellie