The ratio of the observed number of hospital separations that end in the patient's death, to the number of separations expected to end in death based on the patient's characteristics, for principal diagnoses accounting for 80% of in-hospital mortality.

Observed number of in-hospital deaths x 100

Expected number of in-hospital deaths (the sum of the estimated probabilities of death for all separations meeting the denominator criteria, calculated using national risk adjustment coefficients).

Missing: admission mode, sex.

Age at admission (years) • Sex • Principal diagnosis code (mapped to national in-hospital mortality risk deciles) • Admission urgency status: emergency, elective • Length of stay (including leave days) categorised as 1 day, 2 days, 3-9 days, 10-15 days, 16-21 days and 22-365 days • Additional (comorbid) diagnoses (Charlson index) categorised into 0 – Charlson Index score of 0; 1 – Charlson index score of 1; 2 Charlson index score ≥2 • Admission mode (inward transfer status) = admitted patient transferred from another hospital.

By hospital peer group.

Core Hospital-Based Outcome Indicators

Internal state/territory reports

www.safetyandquality.gov.au/publications-and-resources/resource-library/national-core-hospital-based-outcome-indicator-specification

www.safetyandquality.gov.au/sites/default/files/migrated/Specification-for-National-core-hospital-based-outcome-indicator-CHBOI-V3-April-2019.pdf