Table 5 Changes in variability of peak expiratory flow (PEF).

From: Regular exercise improves asthma control in adults: A randomized controlled trial

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]
  1. 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 (%).