This indicator shows the number and percent of people aged zero (more than 28 days old) year of age or over who had at least two admissions with a primary diagnosis of asthma within 91 to 365 days of each other. The method counts back the number of days between the admit date of the most recent admission and the date of discharge of the previous event. ED admissions meeting the three-hour rule are included in this indicator.
High readmission rates in the 91 –365 post the first admission may suggest sub-optimal disease control. This could potentially be due to issues around patients’ understanding of their disease and management plan and /or inhaler technique and / or barriers to primary care access and / or the socioeconomic determinants of health.
Numerator detail
Code (ICD10 AM):
J45 Asthma (for everyone);
J46 Status Asthmaticus (for everyone);
R06.2 Wheeze (for children aged under 11 years)
Denominator detail
- ICD–10: codes: J45–46.
- Includes acute and acute arranged admission types.
Disaggregation
District analysis: By year (2019 –2023), age group (0–4, 5–11, 12–24, 25–44, 45–64, 65+), gender (female, male), ethnic group (Māori, Pacific peoples, European/Other), and Health New Zealand district of domicile.
PHO analysis: By year (2023), age group, gender, ethnic group, Primary Health Organisation (PHO) most recently enrolled with (for the relevant year), PHO group (small, medium, medium-large and large).
Admissions where the individual is aged under 1 year at discharge are excluded from numerator and denominator.
People who were excluded from analysis include:
- those who aren’t enrolled in a PHO in the calendar year. This allowed us to use the number of PHO-enrolled people as the denominator.
- individuals with missing demographics – that is, those with no recorded value for one or more of the NHI fields used to derive the demographic variables of interest (age, gender, ethnicity and district of domicile). For instance, if there are any missing values for age, they are excluded from all analyses. This approach ensures a consistent denominator throughout the analyses.
Age group is assigned using 30 June of each calendar year as the cutoff point. For example, if a person turned 45 years old on 1 July 2023, they will still be considered 44 years old for 2023.
People who died during the calendar year are included in this indicator.
Data is not presented where the number of people in the numerator was less than 10. This is to preserve confidentiality.