20-Year Study Reveals Patterns in Queensland's Childhood Asthma Hospital Admissions

A comprehensive two-decade study of asthma hospital admissions for children in Queensland has identified distinct patterns linked to climate zone, age, and sex. The research found hospitalization rates were highest in hot desert and arid regions and that admission trends for younger children declined over the period, while rates for older children increased.

Study Overview and Methodology

Researchers from Queensland University of Technology analyzed asthma hospitalization data for children and adolescents aged 0 to 19 in Queensland from 2000 to 2019. The study examined patterns based on geographic location, season, age, and sex.

Key Findings

Hospitalization risk was highest in hot desert and arid regions of the state. In these areas, the risk of asthma admission sometimes exceeded the Queensland state average by more than nine times.

• Boys had higher asthma hospitalization rates than girls in the 0–4, 5–9, and 10–14 age groups.
• Girls had higher hospitalization rates than boys during adolescence (ages 15–19).
• For children aged 0–4, hospital admissions peaked in the month of May, with boys comprising the majority of cases in this age group.
• Across all ages, boys showed a stronger peak in hospitalizations in February, while girls exhibited a broader pattern of increased admissions during winter.

• Hospital admissions for the 0–4 age group decreased by more than half over the 20-year study period.
• Admission rates increased among older age groups during the same timeframe.

Context and Expert Commentary

The study authors and an independent expert noted that the observed trends may be influenced by factors beyond changes in asthma prevalence.

Researchers stated that changes in diagnostic criteria and hospital admission practices over the two-decade period might have contributed to the decline in admissions for younger children, rather than solely indicating a reduction in the asthma burden.

Dr. Kerry Hancock, Chair of RACGP Specific Interests Respiratory Medicine, provided further insight:

• The findings on age, sex, and seasonal patterns are consistent with established information, noting the switch in prevalence at puberty and links to seasonal respiratory viruses.
• The study highlights the potential value of public health awareness campaigns tailored to specific geographic regions, as climate and environment influence asthma rates. She suggested similar patterns would likely be found in comparable environmental regions in other Australian states.

Broader Context on Asthma Management

• In 2024, asthma was reported as the leading cause of disease burden for Australian children aged 1–9.
• Dr. Hancock addressed perceptions of asthma management in primary care, citing factors such as patient demand for other conditions, remuneration structures, and access to diagnostic services like spirometry as potential influences on clinical focus.

She emphasized the importance of regular asthma reviews to check medication adherence, ensure correct inhaler technique, and update action plans.

• Noting that infection is a major trigger for asthma flare-ups, Dr. Hancock highlighted influenza vaccination as a key measure to reduce respiratory infections.
• The National Asthma Council recently released new quick reference guides for healthcare providers, summarizing information from the updated Australian Asthma Handbook.