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Serum 25-hydroxyvitamin D levels and lung function in adults with asthma: the HUNT Study

Larose, Tricia L; Langhammer, Arnulf; Chen, Yue; Camargo, Carlos A; Romundstad, Pål Richard; Mai, Xiao-Mei
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2445765
Date
2015
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  • Institutt for samfunnsmedisin og sykepleie [3385]
  • Publikasjoner fra CRIStin - NTNU [35008]
Original version
European Respiratory Journal. 2015, 45 (4), 1019-1026.   10.1183/09031936.00069714
Abstract
The association between vitamin D status and lung function in adults with asthma remains unclear.

We studied this cross-sectional association and possible modification by sex and allergic rhinitis in 760 adults (aged 19–55 years) with self-reported asthma in the Nord-Trøndelag Health Study. Serum 25-hydroxyvitamin D (25(OH)D) level <50 nmol·L−1 was considered deficient. Lung function measurements included forced expiratory volume in 1 s (FEV1) % predicted, forced vital capacity (FVC) % predicted and FEV1/FVC ratio. Multiple linear regression models were used to estimate adjusted regression coefficients (β) and 95% confidence intervals.

44% of asthma adults had serum 25(OH)D levels <50 nmol·L−1. Its associations with lung function measures seemed to be modified by sex and allergic rhinitis (p<0.03 for three-way interaction term). Overall, a serum 25(OH)D level <50 nmol·L−1 was not associated with lung function measurements in subjects with allergic rhinitis in this asthma cohort. In men with asthma but without allergic rhinitis, however, a serum 25(OH)D level <50 nmol·L−1 was significantly associated with lower FEV1/FVC ratio (β=−8.60%; 95% CI: −16.95%– −0.25%).

Low serum 25(OH)D level was not associated with airway obstruction in most asthma adults with the exception of men with asthma but without allergic rhinitis.
Publisher
European Respiratory Society
Journal
European Respiratory Journal

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