Correlations between exhaled nitric oxide (eNO), sputum eosinophilia, and forced expiratory volume in 1 second (FEV1)
| Cough frequency | eNO (ppb) | FEV1 (l) | Eosinophil (%) | |
|---|---|---|---|---|
| Results are expressed as Spearman’s correlations with 95% confidence intervals and p values. | ||||
| Cough frequency | 0.781 (95% CI 0.576 to 0.893) | −0.270 (95% CI −0.580 to 0.607) | 0.173 (95% CI −0.335 to 0.603) | |
| p=0.000 | p=0.157 | p=0.508 | ||
| eNO (ppb) | −0.358 (95% CI −0.632 to 0.001) | 0.436 (95% CI −0.022 to 0.743) | ||
| p=0.071 | p=0.062 | |||
| FEV1 (l) | −0.106 (95% CI −0.524 to 0.353) | |||
| p=0.657 | ||||