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Median (95% CI) exhaled nitric oxide fraction (FeNO) at each visit for the two intervention groups. Analyses of difference between groups at each visit are based on Wilcoxon rank sum tests. p-values at visits 2, 3 and 4 were p=1.00, p=0.01 and p=0.03, respectively. ACQ: Asthma Control Questionnaire.
