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(A) Correlation between exhaled nitric oxide baseline values and loss of bronchoprotection. P = 0.01; r = −0.47. (B) Loss of bronchoprotection in subjects with exhaled nitric oxide values less than 25 ppb (n = 5; ×2 = two subjects with the same loss of bronchoprotection value) and greater than 50 ppb (n = 12). P = 0.01.
