Correlation between baseline gas trapping and bronchial thermoplasty outcome (12 months)
| Pearson correlation coefficient | ||||
| RV (%) | p-value | RV/TLC | p-value | |
| ΔACQ | −0.18 | 0.24 | 0.09 | 0.55 |
| ΔSABA (puffs·day−1) | −0.05 | 0.73 | 0.14 | 0.37 |
| ΔPrednisolone dose (mg·day−1) | 0.006 | 0.97 | 0.04 | 0.79 |
| ΔExacerbations (per annum) | 0.09 | 0.56 | 0.14 | 0.39 |
n=43. RV: residual volume; TLC: total lung capacity; Δ: change; ACQ: Asthma Control Questionnaire score; SABA: short-acting β-agonist.