Proptosis reduction according to the preoperative Hertel values
| Preoperative Hertel value | Number of orbits | Proptosis reduction (mm) (SD) |
| Group 1 (< 22 mm) | 124 | 3.4 (1.75) |
| Group 2 (23–25 mm) | 67 | 4.9 (1.75) |
| Group 3 (25–27 mm) | 48 | 5.8 (2.18) |
| Group 4 (> 27 mm) | 11 | 5.8 (2.12) |
Difference between group 1 and 2 significant (p < 0.01).
Difference between group 2 and 3 significant (p < 0.05).