A method comparison study of FeNO measurements, between the NOA280i and the NIOX VERO - A method comparison study of FeNO measurements, between the NOA280i and the NIOX VERO

FeNO levels measured using the NIOX VERO (mean +- SD 53.4 +- 38.9 ppb) were significantly higher than those using the NOA 280i (41.7 +- 33.2 ppb; P < .0001). However, there was a significant correlation between FeNO levels measured with the two devices (r = 0.946, P < .0001). The Bland-Altman plot showed a moderate degree of agreement between the 2 devices; the mean inter-device difference was 11.7 ppb (95% limits of agreement -13.5 and 37.0 ppb).