Table 2.
Multiple-flow FENO parameter values between post-COVID-19 and HC. *: Mann–Whitney U test; °: median test.
| Multiple-Flows FeNOParameters | Post-COVID | Healthy Controls | p-Value |
|---|---|---|---|
| FeNO 50 (ppb) | 17.3 ± 7.2 | 15.8 ± 4.1 | 0.6336 * |
| Min-max; 25–75 percentile (ppb) | 5–33; 12.2–23 | 7–22; 12.7–20 | Chi-square 0.53, p = 0.817 ° |
| FeNO 100 (ppb) | 14.1 ± 5.1 | 12.2 ± 3.5 | 0.1675 * |
| Min-max; 25–75 percentile (ppb) | 4–24; 11–17 | 6–18; 9.7–15.2 | Chi-square 2.49, p = 0.114 ° |
| FeNO 150 (ppb) | 13.3 ± 8.7 | 9.7 ± 2.4 | 0.2437 * |
| Min-max; 25–75 percentile (ppb) | 2–39; 8–14.5 | 5–14; 8–11.2 | Chi-square 0.65, p = 0.419 ° |
| FeNO 350 (ppb) | 7.2 ± 2.1 | 5.6 ± 1.6 | 0.0199 * |
| Min-max; 25–75 percentile (ppb) | 4–12; 6–8.7 | 1–8; 4–7 | Chi-square 4.18, p = 0.041 ° |
| J’awNO (nL/min) | 44.1 ± 31.9 | 45.3 ± 22.3 | 0.6936 * |
| Min-max; 25–75 percentile (ppb) | 2.8–129.8; 18.6–57.4 | 5.6–90.4; 28.5–54.9 | Chi-square 0.35, p = 0.551 ° |
| CaNO (ppb) | 9.7 ± 6.1 | 4.5 ± 1.6 | 0.0081 * |
| Min-max; 25–75 percentile (ppb) | 1.3–43.1; 5.8–20.6 | 1.2–8.3; 3.6–5.3 | Chi-square 7.57, p = 0.006 ° |
FeNO: fractional exhaled nitric oxide; J’awNO: bronchial maximum flux of NO; CaNO: alveolar concentration of NO.