3.2 MBW test and trial acceptability before implementing real-time quality control
MBW test acceptability results are summarized in Table 3. In Bern, before implementing real-time quality control, 89 MBW trials from 31 test occasions were evaluated. After retrospective analysis of quality control by the reviewer, 68% of test occasions were deemed acceptable. In terms of MBW trials, 51 (57%) were accepted and 38 (43%) were rejected following retrospective quality control by the reviewer. The reasons for trial rejection (details provided in Table 4) included F grade trials whereby the technical acceptability criteria were not met, D grade trials with irregular breathing patterns, and good quality trials (A-C grade) from test occasions without at least two acceptable trials.
In Zurich, before implementing real-time quality control, 97 MBW trials from 34 test occasions were evaluated. After retrospective quality control by the reviewer, only 50% of the test occasions were deemed acceptable. In terms of MBW trials, 47 (49%) were accepted and 50 (51%) were rejected following retrospective quality control by the reviewer. The reasons for trial exclusion (details provided in Table 4) were similar to Bern.