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| Measurement | CCPT mean (SD) | HFCC mean (SD) |
| RV % predicted | −12.5 (3.3) | −15.2 (2.8) |
| RV/TLC | −11.4 (2.6) | −14.4 (1.8) |
| SP3N2 % predicted | −27.9 (5.7) | −15.2 (7.5) |
CCPT: conventional chest physiotherapy; HFCC: high‐frequency chest compression; RV: residual volume; SD: standard deviation; SP3N2: phase 3 of single‐breath nitrogen washout; TLC: total lung capacity.
