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However, it is unknown how asthma, allergic rhinitis (AR) and allergic sensitisation relate to<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>, particularly among adolescents and in overlapping conditions. We sought to determine the associations between asthma, AR, and aeroallergen immunoglobulin (Ig)E and<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>in adolescents.<\/jats:p><jats:p>We measured<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>among 929 adolescents (aged 11\u201316\u2005years) in Project Viva, an unselected prebirth cohort in Massachusetts, USA. We defined asthma as ever asthma physician diagnosis plus wheezing in the past year or taking asthma medications in the past month, AR as a physician diagnosis of hay fever or AR, and aeroallergen IgE as any IgE &gt;0.35\u2005IU\u00b7mL<jats:sup>\u22121<\/jats:sup>among 592 participants who provided blood samples. We examined associations of asthma, AR and IgE with percent difference in<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>in linear regression models adjusted for sex, race\/ethnicity, age and height, maternal education and smoking during pregnancy, and household\/neighbourhood demographics.<\/jats:p><jats:p>Asthma (14%) was associated with 97% higher<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>(95% CI 70\u2013128%), AR (21%) with 45% higher<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>(95% CI 28\u201365%), and aeroallergen IgE (58%) with 102% higher<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>(95% CI 80\u2013126%) compared to those without each condition, respectively. In the absence of asthma or AR, aeroallergen IgE was associated with 75% higher<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>(95% CI 52\u2013101), while asthma and AR were not associated with<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>in the absence of IgE.<\/jats:p><jats:p>The link between asthma and AR with<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>is limited to those with IgE-mediated phenotypes.<jats:italic>F<\/jats:italic><jats:sub>eNO<\/jats:sub>may be elevated in those with allergic sensitisation alone, even in the absence of asthma or AR.<\/jats:p>","DOI":"10.1183\/23120541.00945-2020","type":"journal-article","created":{"date-parts":[[2021,4,1]],"date-time":"2021-04-01T17:06:56Z","timestamp":1617296816000},"page":"00945-2020","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":13,"title":["Contributions of asthma, rhinitis and IgE to exhaled nitric oxide in 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