Cumulative risk adjusted mortality chart for detecting changes in death rate: observational study of heart surgery

Objective: To detect changes in mortality after surgery, with allowance being made for variations in case mix.

Long term relative survival after surgery for abdominal aortic aneurysm in Western Australia: population based study

Objective: To determine the long term relative survival of all patients who had surgery for abdominal aortic aneurysm in Western Australia during 1985-94.