TABLE 4.

Reasons and frequencies of unsuccessful MBW measurements

Finding in individual measurements	Unsuccessful MBW investigations, n=16	Successful MBW investigations with at least 1 unacceptable measurement, n=55
Leak	5 (31.3)	27 (49.1)
End of test criteria not met	2 (12.5)	10 (18.2)
Irregular breathing pattern	2 (12.5)	5 (9.1)
End of test criteria not met/irregular breathing pattern	2 (12.5)	4 (7.3)
Leak/end of test criteria not met	1 (6.3)	3 (5.5)
Leak/end of test criteria not met / irregular breathing pattern	2 (12.5)	1 (1.8)
End of test criteria not met/no washout started	0 (0.0)	2 (3.6)
Leak/irregular breathing pattern	1 (6.3)	0 (0.0)
Leak/swallow at critical time point	0 (0.0)	1 (1.8)
Leak/no washout started	0 (0.0)	1 (1.8)
No washout started	0 (0.0)	1 (1.8)
Use of wrong DSR set	1 (6.3)	0 (0.0)

Data are presented as n (%). MBW: multiple-breath washout; DSR: dead space reducer.