additional_studies_date:
May 2008
| Frequency | Percent | |
| Crowding | 22 | 55.0% |
| Spacing | 10 | 25.0% |
| Class I | 9 | 22.5% |
| Rotation | 5 | 12.5% |
| Relapse | 5 | 12.5% |
| Everything | 5 | 12.5% |
| Class II | 3 | 7.5% |
| Class III | 2 | 5.0% |
| Tipping | 2 | 5.0% |
| Frequency | Percent | |
| Crowding | 22 | 55.0% |
| Spacing | 10 | 25.0% |
| Class I | 9 | 22.5% |
| Rotation | 5 | 12.5% |
| Relapse | 5 | 12.5% |
| Everything | 5 | 12.5% |
| Class II | 3 | 7.5% |
| Class III | 2 | 5.0% |
| Tipping | 2 | 5.0% |
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