pools: Exposure time and asthma symptoms in children
Martin Andersson1, Helena
Backman1, Gunnar Nordberg1, K?re Eriksson1, Linnea Hedman1,
Annika Hagenbj?rk1, Bertil Forsberg1 and Eva R?nmark1
Swimming pool exposure has been suggested to cause asthma and other
health effects in children by exposure to trichloramines.
and Environmental Medicine, The OLIN Studies, Public Health and
Clinical Medicine, Ume?, Sweden
study the prevalence of asthma symptoms and time spent in indoor
swimming pools among children.
A nested case-control study of 337 children with asthma and 663
controls aged 16-17 years within a longitudinal pediatric cohort from
The Obstructive Lung Disease in Northern Sweden studies (OLIN).
Prevalence of symptoms and exposure time at different ages were
obtained by a phone interview. Skin prick testing for inhalant
allergens was available from a previous examination of the cohort.
The participation rate was high both in the original cohort (96%) and
in the case-control study (80%) and the participants in the
case-control study were representative. Children with asthma reported
significantly more irritative eye symptoms, 22%, compared to controls
(9.0%) and 5.5% of the children with asthma reported worsened asthma
symptoms at indoor pools, while 1.5% had stopped attending indoor
swimming pools because of asthma. All children with worsened asthma
symptoms in indoor swimming pools were sensitized to at least one
inhalant allergen. There was no consistent difference in the time spent
in indoor swimming pools between cases and controls.
All children with worsened asthma symptoms in indoor swimming pools
were sensitized to at least one inhalant allergen. There was no
consistent difference in the time spent in indoor swimming pools
between cases and controls.
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