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The ratio of laryngeal vestibule closure across the 10 validation groups.
| Variable | Group 1 | Group 2 | Group 3 | Group 4 | Group 5 |
| Duration ratio | 1.15 | 0.86 | 0.94 | 1.05 | 1.17 |
| Variable | Group 6 | Group 7 | Group 8 | Group 9 | Group 10 |
| Duration ratio | 1.06 | 1.062 | 1.25 | 1.64 | 1.11 |
