Table 3. Comparison between class II pre-treatment and post-treatment parameters.
Test statistic: paired t-test; *p-values less than 0.05 are statistically significant
-Ve values indicate a decrease in values, and +Ve values indicate an increase in values from pre-treatment to post-treatment.
ANB (°): difference between SNA and SNB; CG: condylar guidance in degrees; COS: curve of Spee in mm; FMA (°): Frankfurt horizontal-mandibular plane angle; ICW (mm): intercanine width in lower arch; IMW (mm): intermolar width in lower arch; L1-MP (mm): lower incisor-mandibular plane distance; L1-MP (°): lower incisal inclination to mandibular plane in degrees; L6-MP (mm): lower first molar-mandibular plane distance; L6-MP (°): lower first molar-mandibular plane angle; OB: overbite in mm; OJ: overjet in mm; OP-MP (°): occlusal plane-mandibular plane angle; PM-MP (mm): premolar (first)-mandibular plane distance; SNA (°): angle sella point A in degrees; SNB (°): angle sella point B in degrees; SN-OP (°): sella-nasion plane-occlusal plane angle; U1-PP (mm): upper incisor-palatal plane distance; U1-SN (°): upper incisor-mandibular plane angle; U6-PP (mm): upper first molar-palatal plane distance; WALA-M: William Andrews Larry Andrews point lower first molar; WALA-PM: Willy Andrews Larry Andrews point lower first premolar
| Sl. no | Variables | Parameter | Pre-treatment (T1) (n = 84) | Post-treatment (T2) (n = 84) | Treatment changes mean difference (T2-T1) (n = 84) | p |
| Mean ± SD | Mean ± SD | Mean ± SD | ||||
| 1 | Dependent variable | COS (mm) | 2.97 ± 0.79 | 1.54 ± 0.47 | -1.43 ± 0.68 | <0.001* |
| 2 | Independent variables – skeletal | SNA (0) | 83.78 ± 3.85 | 83.7 ± 3.38 | -0.08 ± 1.73 | 0.81 |
| 3 | SNB (0) | 79.01 ± 3.56 | 79.02 ± 3.11 | 0.01 ± 1.37 | 0.97 | |
| 4 | ANB (0) | 4.76 ± 2.09 | 4.68 ± 1.72 | -0.09 ± 1.36 | 0.74 | |
| 5 | FMA (0) | 26.18 ± 6.99 | 26.68 ± 6.22 | 0.5 ± 2.29 | 0.25 | |
| 6 | SN-OP (0) | 16.4 ± 5.57 | 13.35 ± 5.36 | -3.05 ± 4.06 | <0.001* | |
| 7 | OP-MP (0) | 16.06 ± 3.66 | 17.89 ± 3.96 | 1.82 ± 4.59 | 0.04* | |
| 8 | CG (0) | 43.74 ± 6.25 | 45.18 ± 5.2 | 1.44 ± 4.94 | 0.13 | |
| 9 | Independent variables – dental | LI-MP (0) | 103.25 ± 9.1 | 105.73 ± 6.83 | 2.48 ± 6.87 | 0.05* |
| 10 | U1-SN (0) | 111.4 ± 9.24 | 107.93 ± 7.17 | -3.46 ± 9.53 | 0.06 | |
| 11 | L6-MP (0) | 98.28 ± 5.39 | 100.42 ± 5.08 | 2.14 ± 5.64 | 0.05* | |
| 12 | L6-MP (mm) | 26.39 ± 2.74 | 27.17 ± 2.21 | 0.78 ± 2.03 | 0.05* | |
| 13 | L1-MP (mm) | 35.92 ± 3.27 | 35.17 ± 2.76 | -0.75 ± 2.23 | 0.08 | |
| 14 | U6-PP (mm) | 19.69 ± 2.24 | 19.8 ± 1.99 | 0.11 ± 1.72 | 0.74 | |
| 15 | U1-PP (mm) | 25.45 ± 2.44 | 26.42 ± 2.28 | 0.98 ± 2.19 | 0.02* | |
| 16 | PM-MP (mm) | 23.58 ± 2.64 | 24.52 ± 2.52 | 0.94 ± 1.3 | 0.001* | |
| 17 | ICW (mm) | 25.41 ± 2.66 | 27 ± 2.09 | 2.5 ± 5.88 | 0.017* | |
| 18 | IMW (mm) | 41.7 ± 2.85 | 43.14 ± 2.26 | 2.93 ± 7.79 | <0.001* | |
| 19 | WALA-M (mm) | 1.78 ± 0.54 | 1.28 ± 0.4 | -0.5 ± 0.61 | 0.18 | |
| 20 | WALA-PM (mm) | 0.51 ± 0.43 | 0.62 ± 0.36 | 0.11 ± 0.58 | 0.82 | |
| 21 | OJ (mm) | 4.14 ± 2.51 | 2.48 ± 1 | -1.67 ± 2.07 | 0.8 | |
| 22 | OB (mm) | 4.05 ± 1.87 | 2.54 ± 0.95 | -1.51 ± 1.35 | 1.12 |