Total cohort | Native English countries | Nonnative English countries | ||||
BDI | DD baseline | BDI | DD baseline | BDI | DD baseline | |
SGRQ symptom baseline | −0.35 | 0.34 | −0.35 | 0.26 | −0.34 | 0.35 |
SGRQ activity baseline | −0.63 | 0.44 | −0.68 | 0.35 | −0.61 | 0.46 |
SGRQ impact baseline | −0.59 | 0.36 | −0.58 | 0.30 | −0.60 | 0.40 |
SGRQ total baseline | −0.64 | 0.44 | −0.65 | 0.36 | −0.64 | 0.47 |
DD score baseline | −0.34 | −0.34 | −0.34 | |||
FEV1 baseline | 0.31 | −0.26 | 0.32 | −0.21 | 0.29 | −0.26 |
FVC baseline | 0.25 | −0.18 | 0.21 | −0.11 | 0.27 | −0.19 |
PGE baseline | 0.39 | −0.46 | 0.39 | −0.40 | 0.38 | −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