## 3 Results  
This study included 42 patients with complete available data, including pre- and post-surgical imaging and full data about the surgical movements. Mean age in this study was 21.8 \(\pm\) 6.9 years (range 16-32), with 27 female patients (64.3%) and 15 males (35.7%). Preoperative ST measurements are presented in Table 1. Surgical HT movement measurements are presented in Table 2.  
In 33 of the cases involved advancement of the maxilla. The mean preoperative ST thickness (A-A) was 13.79 \(\pm\) 2.37 mm (range 9-18.9). Mean surgical HT advancement was 5.55 \(\pm\) 2.12 mm (range 1.6-9.1). Analyzing the linear regression of the correlation between preoperative ST thickness and the relation between hard and soft tissue postoperative movement in maxillary advancement cases, there was no significant correlation (r = \(-\)0.101, \(p\) = 0.58), but the general trend points on decrease in relative ST movement with the increase in its initial thickness. Same analysis in cases of less than 5 mm maxillary advancement (16 cases), revealed a clear trend, albeit not statistically significant, of decrease in relative movement of postoperative ST with the increase in its initial thickness (r = \(-\)0.288, \(p\) = 0.28, Figure 2). However, in cases of \(>\)5 mm maxillary advancement (17 cases), there was a trend, albeit not statistically significant, of increase in relative ST movement with the increase in its preoperative thickness (r = 0.308, \(p\) = 0.22, Figure 3). There was no statistically significant difference between pre-surgical ST thickness between the two groups (\(p\) = 0.53, Table 1). \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **N** & **Mean (+SD)** & \(p\) **Value (t-Test)** \\ \hline Preoperative soft tissue thickness upper lip (A-A’—mm) & 33 & 13.79 + 2.37 & \\ \hline Preoperative soft tissue thickness upper lip——5 mm advancement (A-A’—mm) & 16 & 14.06 + 2.77 & \\ \hline Preoperative soft tissue thickness upper lip—\textgreater{}5 mm advancement (A-A’—mm) & 17 & 13.53 + 1.97 & \\ \hline Preoperative soft tissue thickness lower lip (B-B’—mm) & 35 & 11.23 + 1.6 & \\ \hline Preoperative soft tissue thickness lower lip—setback cases (B-B’—mm) & 21 & 11.75 + 1.46 & \\ \hline Preoperative soft tissue thickness lower lip—advancement cases (B-B’—mm) & 14 & 10.28 + 1.46 & \\ \hline Preoperative soft tissue thickness upper lip (Pog-Pog’—mm) & 6 & 11.8 + 2.44 & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Preoperative soft tissue measurements. \begin{table}
\begin{tabular}{c c} \hline \hline  & **Mean (+SD)** \\ \hline Maximly AP advancement (N = 33, mm) & 5.55 + 2.12 \\ Mandibular AP advancement (N = 14 mm) & 5.96 + 2.42 \\ Mandibular AP setback (N = 21 mm) & \(-\)6.21 + 2.52 \\ Chin AP advancement (N = 6 mm) & 6.02 + 3.2 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Surgical hard tissue movement measurements. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Type** & **Count** & **\%** \\ \hline Bi-Maxillary (Two jaws) & 24 & 57.1\% \\ Bi-Maxillary and chin & 4 & 9.5\% \\ Maxilla only & 5 & 11.9\% \\ Maxilla and chin & 1 & 2.4\% \\ Mandible only & 7 & 16.7\% \\ Mandible and chin & 1 & 2.4\% \\ Total & 42 & 100.0\% \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Prevalence of different surgery types. Comparison on ST/HT movement ratio between >5 mm and <5 mm maxillary advancement revealed not statistically significant difference between the groups (0.906 \(\pm\) 0.297 vs. 0.928 \(\pm\) 0.185, \(p\) = 0.797, \(t\)-test). In total, 35 of the cases involved horizontal movement of the mandible. The mean preoperative ST thickness (B-B') was 11.23 \(\pm\) 1.6 mm. Analyzing the linear regression of the correlation between preoperative ST thickness and the relation between hard and ST postoperative movement in mandibular horizontal movement cases, there was no correlation or trend (r = \(-\)0.011, \(p\) = 0.95). We stratified the analysis to check advancement and setback movements separately.