1. Symptom Scores from van der Giessen 2007a.

	DNase before ACT	DNase after ACT	P value (paired t‐test)
VAS viscosity*	1.3 (0.2 to 8.4)	1.3 (0.2 to 8.4)	0.73
VAS sputum amount*	0.7 (0 to 5.1)	1.1 (0.1 to 6.6)	0.14
VAS daytime cough	1.7 (0 to 5.3)	1.9 (1 to 7.4)	0.51
VAS nightime cough*	0.1 (0 to 3.4)	0.2 (0 to 5.7)	0.14
CSS daytime	1.4 (0 to 3)	1.6 (0 to 3.1)	0.28
CSS nighttime	0.4 (0 to 2)	0.7 (0 to 2.6)	0.06

Data are mean (or median if asterisked) and range
 
 ACT: airway clearance technique
 CSS: cough symptom score
 VAS: visual analogue scale