Abstract:
BACKGROUND:Asthma is among the most common chronic diseases in childhood and is steadily increasing in prevalence. Better characterisation of factors that determine the risk of hospitalisation for atopic asthma in childhood may help design prevention programmes and improve our understanding of disease pathobiology. This study will focus on the altitude of residence. METHODS:This is an ongoing prospective birth-cohort study that enrolled all live-born infants in the Tyrol. Between 1994 and 1999, baseline data were collected for 33 808 infants. From 2000 to 2005, all children hospitalised for atopic asthma at the age of > or =6 years (n = 305) were identified by a careful search of hospital databases. Disease status was ascertained from the typical medical history, a thorough examination and proof of atopy. RESULTS:Living at higher altitude was associated with an enhanced risk of hospitalisation for atopic asthma (multivariate RRs (95% confidence interval 2.08 (1.45 to 2.98) and 1.49 (1.05 to 2.11) for a comparison between altitude categories > or =1200 m and 900-1199 m versus <900 m; p<0.001). This finding applied equally to hospital admissions in spring, summer, autumn and winter. When altitude of residence was analysed as a continuous variable, the risk for asthma hospitalisation increased by 7% for each 100-m increase in altitude (p = 0.013). CONCLUSIONS:This large prospective study shows a significant association between the risk of hospitalisation for atopic asthma and altitude of residence between 450 and 1800 m. The underlying mechanisms remain to be elucidated, but it is tempting to speculate about a role for altitude characteristics such as the decline in outdoor temperature and air humidity and increase in ozone levels, which may trigger airway hyper-responsiveness and attenuate lung function.
journal_name
Arch Dis Childjournal_title
Archives of disease in childhoodauthors
Kiechl-Kohlendorfer U,Horak E,Mueller W,Strobl R,Haberland C,Fink FM,Schwaiger M,Gutenberger KH,Reich H,Meraner D,Kiechl Sdoi
10.1136/adc.2006.106278subject
Has Abstractpub_date
2007-04-01 00:00:00pages
339-42issue
4eissn
0003-9888issn
1468-2044pii
92/4/339journal_volume
92pub_type
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journal_title:Archives of disease in childhood
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