Summary Hospital-level Mortality Indicator (SHMI) - Deaths associated with hospitalisation, England, January 2015 - December 2015
The Summary Hospital-level Mortality Indicator (SHMI) is the ratio between the actual number of patients who die following hospitalisation at the trust and the number that would be expected to die on the basis of average England figures, given the characteristics of the patients treated there.
It covers all deaths reported of patients who were admitted to non-specialist acute trusts in England and either die while in hospital or within 30 days of discharge. This publication of the SHMI relates to discharges in the reporting period January 2015 to December 2015.
To help users of the data understand the SHMI, trusts have been categorised into bandings indicating whether a trust's SHMI is 'higher than expected', 'as expected' or 'lower than expected'.
Further background information and supporting documents, including information on how to interpret the SHMI, are available on the SHMI support and guidance page (link below).
- There were approximately 8.8 million finished provider spells, from which 287,000 deaths were recorded either while in hospital or within 30 days of discharge. This includes deaths from other causes as well as deaths related to the reason for the hospital admission.
- 15 trusts had a 'higher than expected' SHMI. Of these 15 trusts, 7 also had a 'higher than expected' SHMI for the same period in the previous year.
- 107 trusts had an 'as expected' SHMI.
- 14 trusts had a 'lower than expected' SHMI. Of these 14 trusts, 10 also had a 'lower than expected' SHMI for the same period in the previous year.
- There is a shortfall in the number of records in the Hospital Episode Statistics (HES) data for discharges in the reporting period January 2015 – December 2015 for Chelsea and Westminster Hospital NHS Foundation Trust (provider code RQM) and North Bristol NHS Trust (provider code RVJ). Further details are provided in the corresponding provisional HES Admitted Patient Care 2015-16 data quality notes (link below). This shortfall has a negligible impact on the SHMI at national level. However, the SHMI values for these trusts will be based on incomplete data and should therefore be interpreted with caution.
- For discharges in the reporting period January 2015 – March 2015, the HES data for Croydon Health Services NHS Trust (provider code RJ6) have missing secondary diagnosis codes in the fields DIAG_04 to DIAG_20 inclusive. Further details are provided in the corresponding finalised HES Admitted Patient Care 2014-15 data quality notes (link below). This has a negligible impact on the SHMI at national level. However, this may have resulted in a larger number of expected deaths being estimated for this trust than would have been the case if the missing data had been included in the analysis and so results for this trust should therefore be interpreted with caution.
- Further information on data quality can be found in Appendix B: Background Quality Report of the SHMI quarterly report, which can be downloaded from the 'Resources' section of this page.