Table 5.
Changes in variability of peak expiratory flow (PEF).
| Group | Baseline | Change 0–3 months | Change 0–6 months | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | CV Mean (%) |
SD | N | CV Mean (%) |
SD | Mean of intraindividual differences 95% CI |
Difference between groups (95% CI) |
N | CV Mean (%) |
SD | Mean of intraindividual differences 95% CI |
Difference between groups (95% CI) |
|
| CV of morning PEF | |||||||||||||
| Intervention | 49 | 3.94 | 2.74 | 43 | 3.94 | 3.45 |
0.17 [−0.97, 1.30] |
— | 27 | 3.55 | 2.38 |
0.02 [−0.99, 1.02] |
— |
| Reference | 55 | 3.89 | 2.10 | 49 | 3.66 | 3.81 |
−0.19 [−1.36, 0.99] |
— | 33 | 3.48 | 2.24 |
−0.48 [−1.46, 0.49] |
— |
| Effect of intervention |
0.35 [−1.27, 1.97] |
0.50 [−0.88, 1.88] |
|||||||||||
| CV of evening PEF | |||||||||||||
| Intervention | 49 | 3.77 | 2.27 | 43 | 3.61 | 3.36 |
−0.12 [−1.31, 1.07] |
— | 28 | 3.23 | 2.91 |
−0.37 [−1.63, 0.89] |
— |
| Reference | 55 | 4.98 | 3.37 | 49 | 3.43 | 3.01 |
−1.59 [−2.78, −0.40] |
— | 33 | 3.36 | 2.20 |
−1.64 [−2.94, −0.34] |
— |
| Effect of intervention |
1.47 [−0.20, 3.14] |
1.26 [−0.53, 3.05] |
|||||||||||
Coefficient of variation (%) calculated for up to 7 daily measurements per period, The Regular Exercise and Asthma Control Trial [REACT]. CV = coefficient of variation = SD/mean (%).