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  • Timm, Signe, et al. (author)
  • Does parental or grandparental farm upbringing influence risk of asthma in offspring?
  • 2020
  • In: European Respiratory Journal. - : ERS Publications. - 0903-1936 .- 1399-3003. ; 56:Suppl 64
  • Journal article (other academic/artistic)abstract
    • Background: Farm upbringing has been associated with lower risk of asthma, and also with methylation of asthma-related genes. As such, farm upbringing has the potential to transfer less asthma risk across generations. We aimed to study generational effects from parental farm upbringing on offspring asthma.Methods: Our study involved three generations: 5,759 participants from the ECRHS study (born 1945-71, denoted G1), their 9,991 parents (G0) and their 8,260 offspring (G2) participating in RHINESSA. Questionnaire data on upbringing and asthma were available for all generations; direct information for G1 and G2, and via G2 for G0. Parental and grandparental place of upbringing was categorised as (1) both parents from farm (2) mother from farm, father from village/city (3) father from farm, mother from village/city (4) both parents from village or one parent from village and one from city (5) both parents from city (ref.). Data was analysed in Cox regression with G2 age as time scale.Results: Parental farm upbringing was not related to offspring asthma when compared to city upbringing (HR 1.12, 95 % CI 0.74-1.69) Findings remained similar when stratified by offspring upbringing and asthma phenotypes. Quantitative bias analyses showed similar estimates for alternative data sources. Grandparental farm upbringing was not associated with offspring asthma in either the maternal (HR 1.05, 95% CI 0.67-1.65) or paternal line (HR 1.02, 95% CI 0.62-1.68).Conclusion: This multi-generation analysis suggests no evidence of an association between parental or grandparental farm upbringing and offspring asthma.
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