This is the protocol for a review and there is no abstract. The objectives are as follows:
We wish to assess the safety and effectiveness of different anaesthetic providers for patients undergoing surgical procedures under general, regional or epidural anaesthetic. A subsidiary question is to determine whether there are types of procedures or patient groups for which a non-physician anaesthetist is not appropriate. We will consider results from studies within different regions (US, UK, other developed countries and developing countries) initially and then assess whether results are consistent across regions before combining results.