Answering your questions about Hospital Standard Mortality Ratio (HSMR)

What is Hospital Standard Mortality Ratio (HSMR)?
How to interpret the HSMR

St. Joseph's Public Reporting

How is HSMR calculated?
How frequently is St. Joseph’s reporting this information?

Answering your questions about Hospital Standard Mortality Ratio (HSMR)

What is Hospital Standard Mortality Ratio (HSMR)?

The Hospital Standard Mortality Ratio (HSMR) is an important measurement tool that provides hospitals with a starting point to assess their mortality trends, identify opportunities for improvement and track their progress.

Public reporting of the HSMR is calculated by the Canadian Institute for Health Information (CIHI) and the results are posted annually on their website.

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How to interpret the HSMR

• An HSMR equal to 100 suggests that there is no difference between the hospital's mortality rate and the overall average rate.
• An HSMR greater than 100 suggests that the local mortality rate is higher than the overall average.
• An HSMR less than 100 suggests that the local mortality rate is lower than the overall average.

It is important to note that the HSMR is not designed for comparisons between hospitals; it is intended to track a hospital's trend over time.

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St. Joseph's Public Reporting

How is HSMR calculated?

The Formula for HSMR is equal to the number of observed deaths divided by the number of expected deaths, multiplied by 100.

Observed deaths: Number of deaths in a hospital

Expected deaths: Expected number of deaths based on overall probability for the current year.

The HSMR is adjusted for other factors affecting mortality such as age, sex and length of stay in the hospital.

Only certain hospitals are included in the CIHI reporting. St. Joseph's Health Centre is included in this reporting. Some hospitals' results were not included because they did not meet CIHI's sample size requirements (2,500 qualifying cases in each of the three years being released). The HSMR calculation is less precise when hospitals treat fewer cases.

In addition, specialty hospitals were not included because they treat a different type of patient. The information gathered from specialty hospitals would not be comparable to figures compiled by general hospitals.

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How frequently is St. Joseph's reporting this information?

HSMR information is posted annually on our website.

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Page last updated: February 03, 2011