About the indicator facts you can see on NHS website 

We have provided a range of information that can help people to answer questions they may have about their treatment and care. The information has been chosen in consultation with clinical experts and Royal Colleges. It is the best information currently available and is regularly updated. It provides a helpful guide to some of the differences between providers but it is not possible, on a website such as this, to cover every aspect. We recommend that you also discuss these issues with your family doctor or other health professional at your GP practice as well as with the hospital doctors treating you. Please click on the links below for more information including when each indicator was last updated.