Table 2.

Wet weight of sputum expectorated: HFCWO compared with usual ACT

Period of sputum collection	Expectorated sputum wet weight (g)
	Usual ACT		HFCWO		Mean difference	p Value
	Mean (SD)	Median (IQR)	Mean (SD)	Median (IQR)
Single treatment session	9.1 (7.9)	7.2 (3.0–14.2)	4.6 (4.1)	3.4 (1.5–6.7)	4.4 (3.5 to 5.4)	<0.001
24 h (excluding treatment)*	22.4 (26.8)	12.9 (4.0–29.9)	24.9 (25.8)	15.3 (3.9–40.1)	−1.5 (−4.6 to 1.6)	0.352
24 h (including treatment)	39.8 (36.3)	25.5 (14.0–57.1)	34.3 (30.7)	26.3 (12.1–46.0)	6.9 (3.1 to 10.8)	<0.001

Data are presented as mean (SD) or (95% CI) or median (IQR) as appropriate. Data are adjusted for randomisation, day, time and position of treatment using a mixed effects linear regression model.

^*Of 116 24-h sputum samples collected, two were discarded as they were incomplete.

ACT, airway clearance technique; HFCWO, high frequency chest wall oscillation.