Table 2

 Changes in variability of peak expiratory flow rate (PEFR)

GroupBaselineChange 0–6 monthsDifference(95% CI)*Change 0–12 monthsDifference(95% CI)*
NMeanSDNMeanSDNMeanSD
CV, coefficient of variation.
*Difference  =  change in intervention group minus change in control group.
CV of morning PEFR
Intervention1077.855.7541−0.424.441.59 (−0.40 to 3.58)82−1.626.470.46 (−1.58 to 2.50)
Control1048.555.2343−2.014.7166−2.085.96
CV of evening PEFR
Intervention1077.005.0941−1.594.610.21 (−1.90 to 2.31)82−1.306.041.42 (−0.58 to 3.43)
Control1048.045.6742−1.805.0267−2.726.30