Study of Exhaled Nitric Oxide in Subjects with Suspected Obstructive Sleep Apnea: A Pilot Study in Vietnam

Table 2

Correlations between AHI and snoring, Epworth score, and exhaled NO.

Parameters	AHI < 5 ()	AHI ≥ 5 ()
Snoring	= −0.084, = 0.654	= −0.216, = 0.125
Epworth score	= −0.085, = 0.654	= −0.021, = 0.883
Nadir SpO2, %	= 0.222, = 0.237	= −0.578, < 0.001
FENO at 50 mL/s, ppb	= 0.074, = 0.699	= 0.373, = 0.007
J’awNO, nL/min	= 0.272, = 0.146	= 0.302, = 0.030
CANO, ppb	= 0.140, = 0.462	= 0.595, < 0.0001

Note: AHI: apnea-hypopnea index; FENO: fractional exhaled nitric oxide (measured at expiratory flows of 50, 100, 150, and 350 mL/s); CANO: alveolar nitric oxide concentration; J’awNO: maximal bronchial flux of nitric oxide (using the two-compartment model).