Exhaled NO levels and dose response ratio (DRR) to histamine in relation to respiratory symptoms in atopic children in the month prior to testing
| No symptoms | Wheeze ± dry cough | Dry cough only | p value | |
|---|---|---|---|---|
| Values are mean (95% confidence interval). | ||||
| No (%) | 122 (53%) | 77 (33%) | 31 (13%) | |
| eNO (ppb) | 12.9 (11.5 to 14.5) | 18.6 (15.8 to 21.4) | 13.5 (10.7 to 17.4) | 0.001 |
| DRR (% fall in FEV1/μmol + 3) | 6.9 (6.0 to 7.9) | 15.9 (12.0 to 20.1) | 6.9 (5.4 to 8.9) | <0.001 |