Control of the expiratory flow in a lung model and in healthy volunteers with an adjustable flow regulator: a combined bench and randomized crossover study

Table 4 Rating of the breathing comfort by the volunteers

Setting	Comfortable [n]	Slightly uncomfortable [n]	Moderately uncomfortable [n]	Very uncomfortable [n]
Baseline	12	16	2	0
Medium flow regulation	11	12	16	1
Strong flow regulation	1	10	10	9

Chi square test: baseline vs. medium p = 0.010; baseline vs. high p < 0.001; medium vs. high p = 0.002

ISSN: 1465-993X