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. 2023 May 5;2023(5):CD002011. doi: 10.1002/14651858.CD002011.pub3

4. Conventional chest physiotherapy (CCPT) versus high‐frequency chest compression (HFCC): sputum weight – Arens 1994.

Weight	Time point	CCPT mean (SD)	HFCC mean (SD)	Significance
Wet weight	1 hour	6.0 (1.8) g	14.6 (2.9) g	P < 0.035
Wet weight	24 hours	30.6 (9.4) g/day	51.3 (6.4) g/day	Non‐significant
Dry weight	1 hour	0.8 (0.2) g	1.4 (0.4) g	Non‐significant
Dry weight	24 hours	3.4 (0.9) g/day	5.3 (0.9) g/day	Non‐significant

CCPT: conventional chest physiotherapy; HFCC: high‐frequency chest compression; SD: standard deviation.