Table 3 Descriptive statistics and statistical comparisons (independent sample t tests) for the T2-T1 changes
Maxillary splint headgear group (N = 28) | Cervical headgear group (N = 28) | Diff. | P | 95% confidence interval | ||||
|---|---|---|---|---|---|---|---|---|
Mean | SD | Mean | SD | Lower | Upper | |||
Age (years) | 1.6 | 0.6 | 1.7 | 0.6 | − 0.1 | 0.339 | − 0.5 | 0.2 |
Wits (mm) | − 0.6 | 2.2 | − 0.2 | 3.2 | − 0.4 | 0.604 | − 1.9 | 1.1 |
Overjet (mm) | − 2.5 | 1.9 | − 0.8 | 0.9 | − 1.7 | 0.000 | − 2.5 | − 0.9 |
Molar relation (mm) | − 3.9 | 2.0 | − 3.5 | 1.5 | − 0.4 | 0.428 | − 1.3 | 0.6 |
Maxillary base (A point-OLp) (mm) | 1.0 | 2.0 | 0.5 | 2.0 | 0.5 | 0.326 | − 0.5 | 1.6 |
Mandibular base (pg-OLp) (mm) | 3.5 | 4.0 | 1.8 | 2.6 | 1.7 | 0.057 | − 0.1 | 3.6 |
Condylar head (co-OLp) (mm) | − 0.1 | 1.9 | 0.7 | 1.3 | − 0.8 | 0.051 | − 1.7 | 0.0 |
Mandibular length (pg-OLp+co-OLp) (mm) | 3.4 | 3.3 | 2.5 | 2.3 | 0.9 | 0.260 | − 0.7 | 2.4 |
Maxillary incisor (is-OLp minus A point-OLp) (mm) | − 1.8 | 1.4 | 0.4 | 1.4 | − 2.2 | 0.000 | − 3.0 | − 1.5 |
Mandibular incisor (ii-OLp minus pg-OLp) (mm) | − 1.9 | 1.5 | − 0.2 | 1.2 | − 1.7 | 0.000 | − 2.5 | − 1.0 |
Maxillary molar (ms-OLp minus A point-OLp) (mm) | − 1.8 | 1.9 | − 1.8 | 1.8 | 0.0 | 0.997 | − 1.0 | 1.0 |
Mandibular molar (mi-OLp minus pg-OLp) (mm) | − 0.5 | 1.4 | 0.4 | 1.5 | − 0.9 | 0.034 | − 1.6 | − 0.1 |
Overbite (mm) | 0.2 | 1.9 | 0.0 | 1.7 | 0.2 | 0.642 | − 0.7 | 1.2 |
SN to Pal.Pl. (deg.) | 1.2 | 1.3 | 1.0 | 1.2 | 0.2 | 0.622 | − 0.5 | 0.9 |
SN to Mand. Pl. (deg.) | 0.3 | 1.4 | − 0.6 | 1.8 | 0.9 | 0.051 | 0.0 | 1.7 |
Pal. Pl. to Mand. Pl. (deg.) | − 0.9 | 1.5 | − 1.6 | 2.1 | 0.7 | 0.180 | − 0.3 | 1.7 |