Table 2.
Basic characteristics of the total study population, as well as of the midpalatal suture separation and non-separation group
| Total | Separation | Non-separation | ||
|---|---|---|---|---|
| N | 34 | 32 | 2 | |
| Age at start of expansion (years) | Mean ± SD | 27.0 ± 9.4 | 26.1 ± 8.2 | 41.2 ± 20.9 |
| Range | 17.1–56.0 | 17.1–47.5 | 26.4–56.0 | |
| Sex | Male | 8 | 6 | 2 |
| Female | 26 | 26 | 0 | |
| Angle classification | Class I | 6 | 5 | 1 |
| Class II/1 | 20 | 20 | 0 | |
| Class II/2 | 6 | 5 | 1 | |
| Class III | 2 | 2 | 0 | |
| Posterior occlusion | Unilateral crossbite | 14 | 13 | 1 |
| Bilateral crossbite | 4 | 4 | 0 | |
| Anticipated crossbite | 12 | 12 | 0 | |
| Constriction without crossbite | 4 | 3 | 1 | |
| Skeletal maturation stage | CVM4 | 3 | 3 | 0 |
| CVM5 | 12 | 12 | 0 | |
| CVM6 | 19 | 17 | 2 |
SD, standard deviation; CVM, cervical vertebral maturation