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Dimensions of Level IIB.
| Dimension | Mean (95% Confidence Interval) | Minimum | Interquartile Range | Maximum |
|---|---|---|---|---|
|
| ||||
| Accessory nerve (cm) | 2.5 (2.4–2.6) | 1.0 | 2.0–3.0 | 5.5 |
| Sternocleidomastoid (cm) | 2.3 (2.2–2.4) | 0.8 | 1.8–2.7 | 4.2 |
| Posterior belly digastric (cm) | 1.1 (1.1–1.2) | 0.4 | 0.9–1.3 | 2.7 |
| Level IIB area (cm2) | 1.3 (1.1–1.4) | 0.2 | 0.7–1.6 | 4.6 |
