Subject characteristics
| Parameter (median, IQR) | Chronic cough | Healthy controls | p Value |
|---|---|---|---|
| Age, years | 45.0 (29–57) | 40.0 (36–60) | 0.74 |
| Gender, M/F | 30/11 | 13/7 | 0.72 |
| Time of cough duration, years | 2.0 (0.8–5.0) | NA | – |
| FEV1, percentage predicted | 106.7 (100.0–117.25) | – | – |
| FVC, percentage predicted | 106.8 (98.2–111.3) | – | – |
| Tiffeneau, FEV1/FVC | 103.0 (98.4–108.0) | – | – |
| eNO, ppb | 13.0 (9.9–16.3) | 16.2 (12.3–17.6) | 0.14 |
| Atopy, yes/no | 8/33 | NA |
Values are expressed as median and IQR, p value tested by Mann–Whitney test.
eNO, exhaled NO; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; ppb, parts per billion.