The association of the baseline dyspnoea index (BDI) and transition dyspnoea index focal scores with other respiratory outcome measures

Total cohortNative English countriesNon­native English countries
BDIDD baselineBDIDD baselineBDIDD baseline
SGRQ symptom baseline−0.350.34−0.350.26−0.340.35
SGRQ activity baseline−0.630.44−0.680.35−0.610.46
SGRQ impact baseline−0.590.36−0.580.30−0.600.40
SGRQ total baseline−0.640.44−0.650.36−0.640.47
DD score baseline−0.34−0.34−0.34
FEV1 baseline0.31−0.260.32−0.210.29−0.26
FVC baseline0.25−0.180.21−0.110.27−0.19
PGE baseline0.39−0.460.39−0.400.38−0.48
  • DD: dyspnoea diary

  • SGRQ: St. George's respiratory questionnaire

  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • PGE: physician's global evaluation