Table 3—

Correlation matrix for response variables

FEV1β-agonist useDSS
Baseline period
 PEFAM0.76−0.18−0.16
 FEV1−0.18−0.13
 β-agonist0.42
Last 9 weeks of treatment
 PEFAM#0.36−0.33−0.35
 FEV1 %−0.31−0.33
 β-agonist %0.58
  • FEV1: forced expiratory volume in one second

  • DSS: daytime symptom score

  • PEFAM: morning peak expiratory flow

  • #: change from baseline

  • : per cent change from baseline. p=0.001 for all data