Recent trends in asthma diagnosis, preschool wheeze diagnosis and asthma exacerbations in English children and adolescents: a SABINA Jr study

 

Kallis C, Maslova E, Morgan AD, Sinha I, Roberts G, van der Valk RJP, Quint JK, Tran TN. Thorax. 2023 Jul 31:thorax-2022-219757.

Abstract

Background: Asthma-related burden remains poorly characterised in children in the UK. We quantified recent trends in asthma prevalence and burden in a UK population-based cohort (1‒17-year-olds).

Methods: The Clinical Practice Research Datalink Aurum database (2008‒2018) was used to assess annual asthma incidence and prevalence in 1‒17-year-olds and preschool wheeze in 1‒5-year-olds, stratified by sex and age.

During the same period, annual asthma exacerbation rates were assessed in those with either a diagnosis of preschool wheeze or asthma.

Trends in (A) incidence rate (per 105 PYs) and
(B) prevalence (%) of asthma in UK children by age
group during the study period (2008–2018).
PY, person-year.

Results: Annual asthma incidence rates decreased by 51% from 1403.4 (95% CI 1383.7 to 1423.2) in 2008 to 688.0 (95% CI 676.3 to 699.9) per 105 person-years (PYs) in 2018, with the most pronounced decrease observed in 1‒5-year olds (decreasing by 65%, from 2556.9 (95% CI 2509.8 to 2604.7) to 892.3 (95% CI 866.9 to 918.3) per 105 PYs). The corresponding decreases for the 6‒11- and 12‒17-year-olds were 36% (1139.9 (95% CI 1110.6 to 1169.7) to 739.9 (95% CI 720.5 to 759.8)) and 20% (572.3 (95% CI 550.4 to 594.9) to 459.5 (95% CI 442.9 to 476.4)) per 105 PYs, respectively. The incidence of preschool wheeze decreased over time and was slightly more pronounced in the 1‒3 year-olds than in the 4-year-olds. Prevalence of asthma and preschool wheeze also decreased over time, from 18.0% overall in 2008 to 10.2% in 2018 for asthma. Exacerbation rates increased over time from 1.33 (95% CI 1.31 to 1.35) per 10 PYs in 2008 to 1.81 (95% CI 1.78 to 1.83) per 10 PYs in 2018.

Conclusion: Paediatric asthma incidence decreased in the UK since 2008, particularly in 1-5-year-olds; this was accompanied by a decline in asthma prevalence. Preschool wheeze incidence also decreased in this age group. However, exacerbation rates have been increasing.

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