The measure is a standardised readmission ratio of the observed number of readmission stays to the predicted number of readmission stays of a district. The numbers are derived based on the number of admissions and readmissions for patients presenting to New Zealand hospitals.

Acute readmission stays.

Index stays.

The following are excluded in both the index and readmission stays: • Non-case mix stays • Mental health stays (that is, the first event being identified as a mental health event). The following are excluded in the index stays but included in the readmission stays: • Deceased patients • Incomplete stays. The following are excluded in the readmission stays but included in the index stays: • Non-acute stays (the first event has a non-acute admission type) • Maternity services (Caesarean Delivery and Vaginal Delivery)

Standardised readmission ratios are illustrated at a national and district level with standardisation for admission type, prior stays, primary diagnosis group, length of stay, age, prior morbidities, and current morbidities.

• District of domicile based on the first event of the index stay (this is for the 28 – 180 day intervals) • Principal District of service (last event of the stay) for the 3,7 and 28 day intervals) • Age in 5-year bands based on the first event of the index stay • Gender • Prioritised ethnicity (Māori, Pacific, and Other in that order) based on the first event of the index stay • NZDep2013 Index of deprivation quintile

National Minimum Dataset (NMDS)

Online at: www.health.govt.nz/statistics-research/system-monitoring/planning-and-performance-data/acute-readmissions-to-hospitals

www.health.govt.nz/statistics-research/system-monitoring/planning-and-performance-data/acute-readmissions-to-hospitals

www.health.govt.nz/system/files/2024-09/20240520-acute-readmissions-technical-definition-v1-5.docx