Table 2 Descriptive statistics according to the demographics of age, anteroposterior skeletal class, and breathing mode
|  | 7–9 years (n = 64) | 10–12 years (n = 62) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Class I | Class II | Class I | Class II | |||||||||
Mouth breathing (n = 15) | Nasal breathing (n = 15) |  | Mouth breathing (n = 19) | Nasal breathing (n = 15) |  | Mouth breathing (n = 16) | Nasal breathing (n = 15) |  | Mouth breathing (n = 16) | Nasal breathing (n = 15) |  | |
SNA° | 79.44 (3.89) | 79.27 (2.78) | NS | 80.16 (3.35) | 80.37 (3.53) | NS | 80.76 (4.38) | 80.84 (4.46) | NS | 82.42 (3.46) | 82.81 (2.68) | NS |
SNB° | 76.29 (2.98) | 76.47 (2.20) | NS | 73.69 (3.51) | 74.00 (3.78) | NS | 77.10 (4.19) | 78.20 (4.20) | NS | 71.07 (17.19) | 76.36 (2.98) | NS |
ANB° | 3.52 (1.15) | 2.83 (0.96) | NS | 6.63 (0.81) | 6.33 (0.53) | NS | 3.64 (1.23) | 2.87 (0.91) | NS | 7.16 (1.17) | 6.52 (0.76) | NS |
FMA° | 30.92 (3.78) | 29.26 (1.87) | NS | 31.71 (2.54) | 30.10 (3.12) | NS | 30.94 (3.56) | 29.52 (2.58) | NS | 31.31 (2.98) | 30.01 (2.50) | NS |
Age (years) | 8.06 (0.88) | 7.86 (0.83) | NS | 8.15 (0.76) | 8.20 (0.86) | NS | 11.18 (0.75) | 11.46 (0.83) | NS | 10.68 (0.87) | 11.26 (0.70) | NS |