Table 2 The clinical characteristics of patients.
From: The effect of genetic polymorphisms on treatment duration following premolar extraction
Clinical variables | All patient (n = 117) | Extreme short group (n = 18) | Extreme long group (n = 18) | P value* Short vs long) |
|---|---|---|---|---|
Age (years), median (range) | 19.8 (12–46.9) | 18.4 (12–34.3) | 19.5 (12–26.7) | 0.558 |
Gender, n (%) | ||||
Female | 93 (79.5) | 15 (83.3) | 13 (72.2) | 0.423 |
Male | 24 (20.5) | 3 (16.7) | 5 (27.8) | |
Angle classification, n (%) | ||||
Class I | 44 (37.6) | 7 (38.9) | 7 (38.9) | 0.073 |
Class II | 57 (48.7) | 10 (55.6) | 5 (27.8) | |
Class III | 16 (13.7) | 1 (5.5) | 6 (33.3) | |
Horizontal anterior retraction(mm), mean ± SD | 4.45 (2.79) | 4.07 (2.82) | 3.99 (2.77) | 0.934 |
Crowding (mm), mean ± SD | 3.72 (3.61) | 5.14 (3.45) | 4.16 (3.88) | 0.424 |
Displacement (mm), | 3.97 (3.33) | 5.14 (3.45) | 4.84 (2.91) | 0.780 |
Overjet (mm) | 3.26 (2.29) | 3.36 (2.01) | 2.35 (2.11) | 0.150 |
Overbite (mm) | 1.57 (2.07) | 0.53 (2.72) | 1.36 (1.79) | 0.285 |
ANB (T1) | 4.01 (2.43) | 4.57 (2.05) | 3.43 (3.29) | 0.220 |
ANB (T2) | 3.66 (2.49) | 4.25 (1.72) | 3.08 (3.49) | 0.212 |
FMA (T1) | 29.90 (5.52) | 31.17 (6.06) | 28.66 (6.70) | 0.246 |
FMA (T2) | 30.24 (8.73) | 30.21 (5.60) | 28.61 (6.58) | 0.436 |
U1 to SN (T1) | 107.16 (7.07) | 106.08 (8.05) | 106.94 (9.52) | 0.771 |
U1 to SN (T2) | 101.00 (6.13) | 100.41 (6.13) | 102.13 (6.98) | 0.437 |
PAR (unweighted) | 5.22 (2.69) | 6.00 (2.47) | 6.17 (3.31) | 0.865 |
PAR (weighted) | 15.75 (9.97) | 17.50 (9.95) | 18.67 (12.42) | 0.758 |
Treatment duration | 26.59 (7.94) | 15.67 (4.78) | 39.06 (5.06) | < 0.001 |
