The Summary Hospital-level Mortality Indicator (SHMI) compares the actual number of patients who die following hospitalisation against the number of patients who would be expected to die on the basis of average for trusts across England, given the characteristics of the patients treated at that Trust. The SHMI includes deaths that have occurred in hospital or within 30 days of discharge from hospital.
A SHMI number of 1 indicates the observed number of deaths was higher than expected A SHMI of 2 indicates the observed number of deaths was as expected and a SHMI of 3 indicates the observed number of deaths was lower than expected, when compared to the national baseline .
SHMI data is published half yearly by NHS Improvement. The data is calculated using Hospital Episode Statistics (HES) data linked to Office for National Statistics (ONS) death registrations data and is published quarterly using a 12 month reporting period.
With any given number of expected deaths, a range of observed deaths is considered “as expected” however if the number falls outside this range, the Trust is then deemed to have a higher or lower SHMI than expected. A higher than expected SHMI should trigger an investigation by the Trust but cannot immediately be attributed to poor performance.
SHMI source data can be found on the NHS Improvement website at: https://digital.nhs.uk/data-and-information/publications/clinical-indicators/shmi. This data is public sector information licensed to Blackwater Law under the Open Government Licence v3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
NHS Trusts are facing increasing demand which can put pressure on services. This, together with other factors, can impact the quality of patient care.
Jason Brady, Blackwater Law Solicitors