Fraction of exhaled nitric oxide measurements in the diagnoses of asthma in elderly patients

Figures & data

Figure 1 Comparison of the average values of FeNO between asthmatics and nonasthmatics.

Abbreviations: FeNO, fraction of exhaled nitric oxide; ppb, parts per billion.

Figure 2 Difference in the average FeNO measurements in the patients with probable asthma (PA) and definitive asthma (DA).

Abbreviations: FeNO, fraction of exhaled nitric oxide; ppb, parts per billion.

Figure 3 Distribution of the spirometry results of the elderly patients.

Abbreviations: DVO, obstructive ventilatory disorder; DVR, restrictive ventilatory disorder.

Table 1 Correlation matrix demonstrating no association between the fraction of exhaled nitric oxide (FeNO) and the spirometric variables

	FeNO
	FVC	FEV1	PEF	PIF	FEV1/FVC%	FEF25%–75%	MEF75%	MEF50%	MEF25%	FET100%	PEF
r	−0.19	−0.15	−0.14	−0.16	0.03	−0.13	−0.12	−0.15	−0.13	−0.09	−0.14
r^2	0.03	0.02	0.02	0.02	0.00	0.02	0.01	0.02	0.02	0.01	0.02
P-value	0.23	0.34	0.37	0.35	0.85	0.42	0.44	0.32	0.39	0.59	0.37

Note: FEV₁/FVC: Tiffeneau index.

Abbreviations: FEF25%–75%, forced expiratory flow between 25% and 75% of FVC; FET, forced expiratory time; FEV₁, forced expiratory volume in one second; FVC, forced vital capacity; MEF, mid expiratory flow; PEF, peak expiratory flow; PIF, peak inspiratory flow; r, correlation coefficient; r², coefficient of determination.