Table 4. Fraction of exhaled nitric oxide (FeNO) values detected by the NIOX and RuiBreath devices grouped by symptom status.

	n	NIOX	RuiBreath	P value
Symptomatic	105	36.92±1.09	40.64±1.08	<0.001
Asymptomatic	92	23.57±1.07	25.84±1.06	0.003

Data are presented as geometric mean ± GSEM.