Table 2.
Descriptive statistics for variables in each age group
| 1 | 2 | 3 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6–12 | 13–16 | 17–25 | 26–33 | 6–12 | 13–16 | 17–25 | 26–33 | 6–12 | 13–16 | 17–25 | 26–33 | |
| Incisal guidance angle(IGA) | 37.47 ± 6.73 | 34.47 ± 6.34 | 35.81 ± 7.00 | 37.34 ± 6.09 | 50.62 ± 3.90 | 49.66 ± 3.14 | 51.06 ± 4.62 | 48.16 ± 3.17 | 69.11 ± 6.95 | 68.15 ± 5.37 | 69.31 ± 7.84 | 72.07 ± 7.10 |
| Occlusal plane angle (OPA) | 6.96 ± 4.50 | 3.70 ± 5.27 | 2.93 ± 4.47 | 2.88 ± 3.56 | 12.68 ± 4.56 | 8.10 ± 3.01 | 7.81 ± 3.21 | 5.60 ± 2.73 | 11.01 ± 4.02 | 8.06 ± 4.84 | 4.63 ± 4.58 | 5.78 ± 4.02 |
| Medial space (MS) | 2.47 ± 0.67 | 2.30 ± 0.60 | 2.70 ± 1.20 | 2.56 ± 0.62 | 1.83 ± 0.60 | 1.95 ± 0.60 | 2.22 ± 0.69 | 2.46 ± 0.71 | 2.09 ± 0.53 | 2.21 ± 0.68 | 2.32 ± 0.61 | 2.29 ± 0.62 |
| Lateral space (LS) | 2.17 ± 0.43 | 1.95 ± 0.40 | 1.92 ± 0.60 | 2.16 ± 0.61 | 1.87 ± 0.59 | 1.56 ± 0.44 | 2.04 ± 0.66 | 1.88 ± 0.50 | 1.91 ± 0.50 | 1.92 ± 0.44 | 1.96 ± 0.43 | 1.93 ± 0.52 |
| Medial inclination of the condyle (MIC) | 14.83 ± 3.29 | 14.96 ± 3.42 | 16.48 ± 6.35 | 17.05 ± 3.77 | 15.97 ± 4.86 | 17.67 ± 2.92 | 16.10 ± 3.58 | 15.30 ± 4.01 | 14.26 ± 2.67 | 15.59 ± 4.07 | 15.12 ± 4.61 | 14.79 ± 4.14 |
| Lateral inclination of the condyle (LIC) | 18.94 ± 4.86 | 18.12 ± 4.29 | 18.62 ± 4.89 | 19.01 ± 4.42 | 16.80 ± 4.28 | 18.13 ± 3.05 | 17.78 ± 4.83 | 18.96 ± 5.15 | 16.09 ± 5.20 | 18.32 ± 3.89 | 14.84 ± 4.11 | 17.72 ± 5.05 |
| Superior space (SS) | 2.83 ± 0.65 | 2.80 ± 0.46 | 2.87 ± 0.80 | 3.16 ± 0.63 | 2.59 ± 0.65 | 2.38 ± 0.60 | 2.95 ± 0.75 | 2.94 ± 0.59 | 2.48 ± 0.40 | 2.76 ± 0.42 | 2.91 ± 0.62 | 2.97 ± 0.65 |
| Anterior space (AS) | 1.84 ± 0.43 | 1.65 ± 0.41 | 1.88 ± 0.56 | 1.95 ± 0.55 | 1.51 ± 0.48 | 1.61 ± 0.47 | 1.81 ± 0.39 | 1.81 ± 0.55 | 1.47 ± 0.39 | 1.83 ± 0.65 | 1.95 ± 0.79 | 2.02 ± 0.76 |
| Posterior space (PS) | 2.05 ± 0.54 | 1.70 ± 0.44 | 1.74 ± 0.52 | 1.81 ± 0.47 | 1.73 ± 0.60 | 1.36 ± 0.26 | 1.64 ± 0.42 | 1.64 ± 0.34 | 1.69 ± 0.40 | 1.73 ± 0.38 | 1.66 ± 0.41 | 1.73 ± 0.44 |
| Anterior inclination of the condyle (AIC) | 25.17 ± 6.71 | 28.41 ± 6.51 | 29.39 ± 6.15 | 31.12 ± 5.09 | 23.58 ± 5.07 | 28.04 ± 5.34 | 29.26 ± 4.08 | 29.13 ± 4.04 | 25.78 ± 4.80 | 28.62 ± 6.17 | 30.81 ± 6.41 | 32.68 ± 5.50 |
| Posterior inclination of the condyle(PIC) | 25.64 ± 7.02 | 24.00 ± 4.57 | 25.59 ± 5.35 | 25.91 ± 4.94 | 25.17 ± 5.50 | 26.47 ± 3.11 | 25.52 ± 4.15 | 28.10 ± 4.43 | 25.18 ± 4.78 | 25.85 ± 4.59 | 25.14 ± 4.15 | 25.86 ± 4.87 |
| Height of the fossa (HF) | 6.40 ± 0.91 | 6.64 ± 1.36 | 6.10 ± 1.12 | 6.17 ± 0.80 | 5.83 ± 0.84 | 6.60 ± 0.67 | 6.96 ± 0.96 | 6.33 ± 0.82 | 6.21 ± 1.02 | 6.74 ± 0.97 | 6.63 ± 1.00 | 6.54 ± 0.77 |
| Width of the fossa (WF) | 16.57 ± 1.46 | 16.76 ± 1.85 | 16.88 ± 1.97 | 16.69 ± 1.15 | 16.51 ± 1.40 | 17.19 ± 1.46 | 16.94 ± 1.49 | 16.25 ± 1.46 | 16.49 ± 1.98 | 17.46 ± 1.51 | 17.04 ± 1.49 | 16.72 ± 1.64 |
| Articular eminence inclination (AEI) | 35.01 ± 5.58 | 32.57 ± 5.16 | 31.64 ± 6.70 | 31.70 ± 4.68 | 31.35 ± 4.09 | 33.85 ± 4.55 | 35.94 ± 7.14 | 33.14 ± 4.89 | 32.74 ± 5.16 | 33.46 ± 5.48 | 34.74 ± 6.70 | 35.48 ± 4.78 |
| Long axis of the condyle (LAC) | 16.43 ± 1.46 | 17.97 ± 2.17 | 18.33 ± 2.30 | 18.88 ± 1.63 | 16.34 ± 2.46 | 18.56 ± 1.81 | 19.78 ± 1.94 | 19.32 ± 1.93 | 16.91 ± 1.92 | 18.18 ± 1.70 | 19.56 ± 2.78 | 19.23 ± 1.91 |
| Minor axis of the condyle (MAC) | 8.35 ± 0.77 | 8.83 ± 0.87 | 9.15 ± 0.76 | 9.32 ± 0.84 | 9.45 ± 1.12 | 9.02 ± 0.63 | 9.45 ± 0.63 | 9.18 ± 0.76 | 8.64 ± 0.81 | 8.83 ± 0.87 | 8.96 ± 0.79 | 9.06 ± 0.87 |
1: IGA < 45°; 2: 45° ≤ IGA ≤ 60°; 3: IGA > 60°