| PCD | Healthy controls | p-value | Ref. | |
| FeNO50 ppb | 2.1 (1.3–3.5) (n=14) | 6.7 (2.6–11.9) (n=37) | 0.001 | [47] |
| 2.9 (1.9–4.6)# (n=17) | 6.4 (4.8–8.6)# (n=24) | 0.11+ | [48] | |
| 8.1 (1.3)# (n=24) | 12.5 (1.6)# (n=20) | 0.033 | [49] | |
| 3.2 (0.2)# (n=15) | 8.5 (0.9)# (n=14) | <0.0001 | [50] | |
| 7.1 (5.7–8.8)# (n=20) | 13.9 (11.7–16.4)# (n=20) | <0.01 | [51] | |
| Nasal NO ppb | 54.5 (5.0–269) (n=14) | 663 (322–1343) (n=37) | <0.001 | [47] |
| 64±36.6 (n=42) | 759±145.8 (n=16) | <0.0001 | [52] | |
| 13.7 (6.8–27.8)# (n=17) | 223.7 (175.5–285.2)# (n=24) | <0.05 | [48] | |
| 59.6±12.2 (n=15) | 505.5±66.8 (n=14) | <0.001 | [50] | |
| 49 (34–64)# (n=20) | 639 (422–890)# (n=20) | <0.01 | [53] | |
| 142±42¶ (n=45) | 908±33¶ (n=49) | <0.0001 | [53] | |
| 55 (3.3–959) (n=21) | 553 (116±1437) (n=20) | <0.001 | [7] | |
| 4 (1)# (n=4) | 221 (14)# (n=20) | <0.001 | [3] |
Data are presented as median (range) or mean±sd, unless otherwise stated. FeNO50: exhaled nitric oxide measured at a set exhalation flow rate of 50 mL·s−1. #: mean (95% CI); ¶: mean±se; +: nonsignificant.