| Category | Incidence (%) | |||
|---|---|---|---|---|
| Group 1(110 DAH ) | Group 2(140 DAH) | Group 3(180 DAH) | Group 4(300 DAH) | |
| Normal | 80.5 | 78.1 | 76.1 | 75.0 |
| Deformity in head | 6.1 | 4.3 | 4.3 | 3.0 |
| Deformity in vertebrae | 4.9 | 2.4 | 4.3 | 4.0 |
| Deformity in operculum | 4.9 | 8.5 | 5.1 | 8.0 |
| Complication | 3.6 | 1.8 | 8.5 | 5.0 |
| Etc. | 0 | 4.9 | 1.7 | 5.0 |