Iron Status is Associated with Asthma and Lung Function in US Women.

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Iron Status is Associated with Asthma and Lung Function in US Women.

PLoS One. 2015;10(2):e0117545

Authors: Brigham EP, McCormack MC, Takemoto CM, Matsui EC

Abstract
BACKGROUND: Asthma and iron deficiency are common conditions. Whether iron status affects the risk of asthma is unclear.
OBJECTIVE: To determine the relationship between iron status and asthma, lung function, and pulmonary inflammation.
METHODS: Relationships between measures of iron status (serum ferritin, serum soluble transferrin receptor (sTfR), and sTfR/log10ferritin (sTfR-F Index)) and asthma, lung function, and pulmonary inflammation were examined in women 20-49 years in the National Health and Nutrition Examination Survey. Logistic, linear, and quadratic regression models accounting for the survey design of NHANES were used to evaluate associations between iron status and asthma-related outcomes and were adjusted for race/ethnicity, age, smoking status, income, and BMI.
RESULTS: Approximately 16% reported a lifetime history of asthma, 9% reported current asthma, and 5% reported a recent asthma episode/attack (n = 2906). Increased ferritin (iron stores) was associated with decreased odds of lifetime asthma, current asthma, and asthma attacks/episodes in the range of ferritin linearly correlated with iron stores (20-300ng/ml). The highest quintile of ferritin (>76 ng/ml) was also associated with a decreased odds of asthma. Ferritin levels were not associated with FEV1. Increased values of the sTfR-F Index and sTfR, indicating lower body iron and higher tissue iron need, respectively, were associated with decreased FEV1, but neither was associated with asthma. None of the iron indices were associated with FeNO.
CONCLUSION: In US women, higher iron stores were inversely associated with asthma and lower body iron and higher tissue iron need were associated with lower lung function. Together, these findings suggest that iron status may play a role in asthma and lung function in US women.

PMID: 25689633 [PubMed – as supplied by publisher]

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