Table 3. Comparison of mean pre- and postoperative Hertel exophthalmometry readings using two-tailed paired t-tests and mean percentage decreases (absolute reduction in proptosis/preoperative exophthalmometry) according to type of surgery.
| Type of surgery | N | Mean pre-op | Mean post-op | Difference between means | 95% CI | P-value | Mean % decrease | SD % decrease |
|---|---|---|---|---|---|---|---|---|
| Lateral (single) wall | 61 | 23.5 | 19.3 | 4.2 | 3.7–4.8 | <0.0001 | 17.9 | 8.1 |
| Two-and-a-half wall | 11 | 27.8 | 20.2 | 7.6 | 5.8–9.4 | <0.0001 | 26.7 | 7.0 |
| Medial one-and-a-half wall | 17 | 23.0 | 20.2 | 2.9 | 2.1–3.7 | <0.0001 | 12.3 | 5.6 |
Abbreviation: CI, confidence interval.