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‘Back to school asthma’ linked to tripling in rate of health service appointments

Condition seems to particularly affect under 5s and boys, monitoring data for England show

‘Back to school asthma’--a seasonal peak in cases associated with the start of the school year in September--is linked to a tripling in the rate of family doctor (GP) appointments across England, reveals research published online in the Journal of Epidemiology & Community Health.

The phenomenon seems to particularly affect the under 5s and boys, national monitoring data show.

The prevalence of asthma and associated deaths and use of healthcare services in the UK are thought to be the highest in the world. And ‘back to school asthma’ accounts for up to a quarter of serious bouts of the condition in many northern hemisphere countries. 

But it’s not clear where the resulting pressure points on healthcare services might be. In a bid to find out, the researchers analysed routine monitoring data for family doctor consultations about worsening asthma, both within and outside normal practice hours, as well as related visits to hospital emergency care departments between 2012 and 2016.

They looked at the time and sex specific trends for 0-4 and 5-14 year olds for the last four weeks of the summer holiday up to the first 6 to 7 weeks of the autumn term.

All three sources of data indicated similar age and sex specific patterns, with use of health services for asthma up to 2.4 times higher among boys in both age groups than among girls.

The highest rate of asthma cases was among 5 to 14 year old boys for each of the three services.

Rates of GP in hours appointments for asthma fell during school holidays, followed by an increase in the first two to three weeks of each of the autumn half terms, with the sharpest rise at the start of the school year in September.

Patterns for GP out of hours services were similar to those of in hour consultations. And emergency care department visits for worsening asthma also peaked at the start of the school year for both age groups.

Across the entire study period, the average delay between the start of the school year and the ‘back to school’ effect varied for each of the years, beginning as late as 17 days afterwards and as early as 7 days before.

But after taking account of these annual variations and sex differences, the daily in hours consultation rate for worsening bouts of asthma was more than three times as high in the back to school period as during the summer holidays for children up to the age of 4. And it was 2.5 times as high for 5-14 year olds.

For GP out of hours consultations, the rates were around twice as high for both age groups.

No such obvious peaks were seen for children aged 15 and older.

This is an observational epidemiological study, and as such, can’t establish cause. The coding applied to surveillance data may vary in quality, acknowledge the researchers. And it can be difficult to accurately diagnose asthma in young children because of the range of other factors than can produce similar respiratory symptoms.

But the very large number of children studied over several years lends weight to the findings, say the researchers, who suggest that multiple factors are likely to be involved.

These might include changes in the weather, air pollution, the stress of starting a new school year, and seasonal increases in circulating viruses, particularly rhinovirus, which is implicated in worsening childhood asthma.

“The underlying aetiology of [‘back to school’] asthma is complex and in addition to the established contribution of respiratory infections, environmental determinants may be involved: the role of fungal spores (which show autumnal seasonality) could be an area for future research to investigate aetiology and thus determine potential future interventions,” suggest the researchers.

“These results support the need for further preventable work to reduce the impact of [back to school] asthma in children,” they conclude.



Notes for editors

Research: Monitoring epidemiological trends in back to school asthma among preschool and school-aged children using real-time syndromic surveillance in England, 2012-2016 doi 10.1136/jech-2018-211936
Journal: Journal of Epidemiology & Community Health

Link to AMS labelling system: https://press.psprings.co.uk/AMSlabels.pdf  

Peer reviewed? Yes
Evidence type: Surveillance data; observational
Subjects: Children

Link to paper: https://jech.bmj.com/content/early/2019/05/28/jech-2018-211936

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