An immersion method is used and mortality data taken periodically.
The index was developed decades ago by life insurance companies, based on mortality data at the time.
Regional health authorities will from time to time produce mortality data at ward level.
There are practical problems with the use of mortality data.
This may not matter with mortality data, where it seems unlikely that there would be very rapid transformation in the main causes of death.
As might be expected from the study of mortality data acute health problems are not equally distributed throughout the population.
That is a 39 percent drop since 1989, when the state first began to collect mortality data on bypass surgery.
For those of you who haven't read the original source, the mortality data are age-standardised.
Dr. Rodgers looked at 29 years' worth of mortality data, from 1964 to 1992.
Trust website, including sections on its history, current news, mortality data and other patient information.