Table 1 The baseline demographic information and cephalometric analysis of included patients
|  | Extraction group (n = 120) | Non-extraction group (n = 40) Mean (SD) | |||
|---|---|---|---|---|---|
Class I-norm (n = 30) Mean (SD) | Class I-hyper (n = 30) Mean (SD) | Class II-norm (n = 30) Mean (SD) | Class II-hyper (n = 30) Mean (SD) | ||
Demographic | |||||
 Age, years | 24.8 (3.6) | 24.3 (4.1) | 26.1 (2.9) | 25.1 (3.2) | 26.4 (4.9) |
 BMI, kg/m2 | 21.2 (1.2) | 22.4 (2.1) | 20.8 (1.8) | 21.1 (1.8) | 22.1 (2.4) |
 Treatment duration, years | 2.6 (0.6) | 2.5 (0.4) | 2.7 (0.3) | 2.7 (0.4) | 2.0 (0.3) |
Cephalometric analysis | |||||
 SNA | 82.3 (1.6) | 81.5 (1.3) | 81.1 (2.2) | 83.2 (2.1) | 82.1 (3.2) |
 SNB | 79.4 (2.4) | 78.1 (2.3) | 74.8 (2.7) | 75.2 (3.2) | 76.9 (2.2) |
 ANB | 2.9 (1.2) | 3.4 (1.1) | 5.9 (1.8) | 6.7 (1.9) | 5.2 (1.7) |
 SN-MP | 32.3 (3.0) | 43.2 (3.1) | 34.1 (2.1) | 41.9 (2.4) | 37.2 (3.8) |
 U1-SN | 115.7 (4.2) | 112.2 (3.9) | 106.2 (5.2) | 104.2 (4.4) | 101.2 (6.3) |
 L1-MP | 97.6 (5.6) | 98.3 (6.2) | 99.4 (4.2) | 102.1 (6.8) | 94.2 (7.9) |
 U1-X, mm | 63.9 (3.5) | 64.7 (4.2) | 64.1 (3.9) | 65.2 (2.9) | 62.8 (3.8) |
 L1-X, mm | 61.4 (4.3) | 61.7 (5.1) | 60.2 (6.0) | 61.3 (4.7) | 61.2 (2.7) |