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Descriptive statistics for maximum diameter of upper esophageal sphincter opening, expressed as percentage of the C2–C4 reference scalar.
| Consistency | M | SD | 95% confidence interval |
|
|---|---|---|---|---|
| Lower bound | Upper bound | |||
| Thin | 20.6 | 6.6 | 19.3 | 21.8 |
| Slightly thick | 18.7 | 5.8 | 17.7 | 19.8 |
| Mildly thick | 18.3 | 5.1 | 17.4 | 19.3 |
| Moderately thick | 15.6 | 5.3 | 14.7 | 16.6 |
| Extremely thick | 16.9 | 4.7 | 16.0 | 17.7 |
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