Correlation matrix
| FEV1 | PEFvar | Symptom score | Exhaled NO | Eosinophils | β2agonist | |
| PEF variability | –0.332 | |||||
| (NS) | ||||||
| Symptom score | 0.009 | 0.429 | ||||
| (NS) | (0.014) | |||||
| Exhaled NO | –0.102 | –0.079 | –0.020 | |||
| (NS) | (NS) | (NS) | ||||
| Eosinophils | –0.433 | 0.231 | –0.136 | 0.146 | ||
| (0.019) | (NS) | NS | NS | |||
| β2agonist | –0.475 | 0.654 | 0.459 | –0.013 | 0.266 | |
| (0.006) | (0.000) | (0.000) | NS | NS | ||
| PEF | 0.472 | –0.506 | 0.032 | 0.164 | –0.412 | –0.480 |
| (0.006) | (0.003) | NS | NS | (0.026) | (0.005) |
Data shown as correlation coefficient (p value).
FEV1 = forced expiratory volume in one second (% predicted); PEF = morning peak expiratory flow; PEFvar = peak flow variability; symptom score = mean daily symptom score; exhaled NO = nitric oxide; eosinophils = number of MBP positive cells/HPF; β2 agonist = number of puffs of β2 agonist per day.