The effects of growing up on a farm on adult lung function and allergic phenotypes: an international population-based study.
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Authors
Campbell, BRaherison, C
Lodge, C J
Lowe, A J
Gislason, T
Heinrich, J
Sunyer, J
Gómez Real, F
Norbäck, D
Matheson, M C
Wjst, M
Dratva, J
de Marco, R
Jarvis, D
Schlünssen, V
Janson, C
Leynaert, B
Svanes, C
Dharmage, S C
Issue Date
2017-03
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The effects of growing up on a farm on adult lung function and allergic phenotypes: an international population-based study. 2017, 72 (3):236-244 ThoraxAbstract
Evidence has suggested that exposure to environmental or microbial biodiversity in early life may impact subsequent lung function and allergic disease risk.To investigate the influence of childhood living environment and biodiversity indicators on atopy, asthma and lung function in adulthood.
The European Community Respiratory Health Survey II investigated ∼10 201 participants aged 26-54 years from 14 countries, including participants' place of upbringing (farm, rural environment or inner city) before age 5 years. A 'biodiversity score' was created based on childhood exposure to cats, dogs, day care, bedroom sharing and older siblings. Associations with lung function, bronchial hyper-responsiveness (BHR), allergic sensitisation, asthma and rhinitis were analysed.
As compared with a city upbringing, those with early-life farm exposure had less atopic sensitisation (adjusted OR 0.46, 95% CI 0.37 to 0.58), atopic BHR (0.54 (0.35 to 0.83)), atopic asthma (0.47 (0.28 to 0.81)) and atopic rhinitis (0.43 (0.32 to 0.57)), but not non-atopic outcomes. Less pronounced protective effects were observed for rural environment exposures. Women with a farm upbringing had higher FEV1 (adjusted difference 110 mL (64 to 157)), independent of sensitisation and asthma. In an inner city environment, a higher biodiversity score was related to less allergic sensitisation.
This is the first study to report beneficial effects of growing up on a farm on adult FEV1. Our study confirmed the beneficial effects of early farm life on sensitisation, asthma and rhinitis, and found a similar association for BHR. In persons with an urban upbringing, a higher biodiversity score predicted less allergic sensitisation, but to a lesser magnitude than a childhood farm environment.
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Archived with thanks to Thoraxae974a485f413a2113503eed53cd6c53
10.1136/thoraxjnl-2015-208154
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