Many patients admitted to Stanford Health Care are very sick with
complicated medical conditions that decrease their chances for
survival. The "mortality ratio" compares patients' actual
mortality rates to their expected mortality rates-which take into
account the severity of a patient's illness. A lower score mortality
ratio means that more patients survived than were expected due to the
severity of their illnesses.
Our mortality ratio is excellent, particularly given the number of
severely ill, high-risk patients at Stanford Health Care. Stanford
Health Care's mortality ratio for Q4 2015 was 0.87 (red bar).
Mortality ratio trended over time
What this graph says
This graph shows mortality ratios for the past two years. Stanford
Health Care (red bar) has consistently performed near the benchmark
(yellow bar) and significantly better than the standard (blue bar)
where observed mortality equals the expected rate.
Explaining mortality ratio
Mortality ratios are quality data that compare patients' actual vs.
expected mortality rates, based on patients' illnesses.
Mortality ratio = Observed mortality / Expected mortality
Observed mortality is the number of patient deaths that occur
in the hospital.
Expected mortality is the predicted number of deaths in the
hospital based on the hospital's patients' levels of illness. Patients
who are very sick (higher severity of illness) have a higher expected
mortality rate. However, the expected mortality rate does not reflect
a hospital's quality of care. If two hospitals had patients with
exactly the same severity of illnesses, the hospitals' expected
mortality rates would be the same.
The standard ratio of 1.0 indicates that the observed
mortality rate equaled the expected mortality rate based on patients'
level of illness.