Figure 2  The relationship between FeNO and symptoms evaluated by the G scale.
Notes: (A) The frequency of daytime phlegm during the last month, evaluated by the G scale, is positively correlated with FeNO. Spearman’s rank correlation coefficient (ρ) is 0.130 (P=0.042). (B) FeNO is significantly higher in patients with daytime phlegm than in patients without it (*P<0.05). (C) The frequency of losing the sense of smell during the last month is also positively correlated with FeNO (ρ=0.219, P=0.001). (D) FeNO is significantly higher in patients who reported loss of the sense of smell during the last month than in patients who did not (**P<0.01).
Abbreviations: FeNO, fractional exhaled nitric oxide; ppb, parts per billion; G scale, frequency scale for the symptoms of asthma and rhinosinusitis developed in Gunma.