Diurnal variation difference, expressed as steroid − placebo
| Mean diurnal variation | ||||
|---|---|---|---|---|
| Days postexacerbation | Steroid | Placebo | Difference % (95% CI) | p value |
| 1–3 | 8.2 | 11.5 | −3.3 (−7.7 to 1.1) | 0.13 |
| 4–10 | 9.0 | 7.2 | 1.8 (−0.5 to 4.1) | 0.13 |
| 11–14 | 5.5 | 4.5 | 1.0 (−1.0 to 3.0) | 0.38 |
Diurnal variation is (highest − lowest)/highest PEFR.