Table 1 Preoperative parameters and score calculation
| Sex | Female | 0 |
| Male | 1 | |
| BMI (kg/m2) | < 30 | 0 |
| ≥ 30 | 1 | |
| Neck length (cm) | ≥ 6 cm | 0 |
| < 6 cm | 2 | |
| Neck extensibility (cm) | Normal | 0 |
| Reduced | 2 | |
| Thyroid volume (ml) | ≤ 80 ml | 0 |
| > 80 ml | 3 | |
| Hypervascularization | No | 0 |
| Yes | 3 | |
| Thyroiditis | No | 0 |
| Yes | 3 | |
| Score level | Low | 0–3 |
| Medium | 4–5 | |
| High | 6–15 |
