## 3 Results
### Expansion Predictability
The lowest % expansion was for intercanine width in both the unilateral group (\(-93.33\%\), i.e., compression, not expansion) and the bilateral group (54.17\(\%\), respectively) and at first molar level in the single-tooth crossbite group (65.76\(\%\)). Table 3 displays between-group comparisons of the predictability (T2-T3) of expansion (T2-T3) at the canine, premolar, and molar levels. No statistically significant differences were found for any comparison between the groups (95\(\%\)CI contains the value 0). The lowest % expansion was for intercanine width in both the unilateral group (\(-93.33\%\), i.e., compression, not expansion) and the bilateral group (54.17\(\%\), respectively) and at first molar level in the single-tooth crossbite group (65.76\(\%\)). Table 3 displays between-group comparisons of the predictability (T2-T3) of expansion (T2-T3) at the canine, premolar, and molar levels. No statistically significant differences were found for any comparison between the groups (95\(\%\)CI contains the value 0). \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Within-Group Comparisons**} & \multicolumn{2}{c}{**Mean (mm)**} & \multicolumn{2}{c}{**95\% CI**} & \multicolumn{2}{c}{**\(p\)-Value**} & \multicolumn{2}{c}{**T2-T3 (\%)**} & \multicolumn{2}{c}{**\% Relative**} \\ \multicolumn{2}{c}{**T2 - T3**} & \multicolumn{2}{c}{\(\pm\) SD**} & \multicolumn{2}{c}{**T2-T3 (mm)**} & \multicolumn{2}{c}{**95\% CI**} & \multicolumn{2}{c}{**\(p\)-Value**} & \multicolumn{2}{c}{**T2-T3 (\%)**} & \multicolumn{2}{c}{**Predictability:**} \\ \hline \multirow{6}{*}{
\begin{tabular}{c} Unilateral \\ Crossbite \\ \end{tabular} } & \multirow{2}{*}{Canine} & T2: PRED & 33.73 \(\pm\) 1.88 & \multirow{2}{*}{0.29} & \multirow{2}{*}{\(-0.30\) to 0.88} & \multirow{2}{*}{0.597} & \multirow{2}{*}{0.87\(\%\)} & \multirow{2}{*}{\(-93.33\%\)} \\ \cline{3-3} \cline{5-10}  & & T3: POST & 33.44 \(\pm\) 1.74 & & & & & & \\ \cline{2-10}  & \multirow{2}{*}{1 st Premolar} & T2: PRED & 41.98 \(\pm\) 1.97 & \multirow{2}{*}{0.68} & \multirow{2}{*}{\(-0.36\) to 1.72} & \multirow{2}{*}{0.296} & \multirow{2}{*}{1.65\(\%\)} & \multirow{2}{*}{70.82\(\%\)} \\ \cline{2-10}  & & T3: POST & 41.30 \(\pm\) 2.44 & & & & & & \\ \cline{2-10}  & \multirow{2}{*}{2 nd} & T2: PRED & 47.54 \(\pm\) 1.99 & \multirow{2}{*}{0.67} & \multirow{2}{*}{\(-0.27\) to 1.62} & \multirow{2}{*}{0.221} & \multirow{2}{*}{1.43\(\%\)} & \multirow{2}{*}{79.19\(\%\)} \\ \cline{2-10}  & & T3: POST & 46.87 \(\pm\) 1.99 & & & & & & \\ \cline{2-10}  & \multirow{2}{*}{1 st} & T2: PRED & 51.65 \(\pm\) 2.07 & \multirow{2}{*}{0.72} & \multirow{2}{*}{\(-0.22\) to 1.66} & \multirow{2}{*}{0.167} & \multirow{2}{*}{1.41\(\%\)} & \multirow{2}{*}{74.29\(\%\)} \\ \cline{2-10}  & & T3: POST & 50.93 \(\pm\) 2.08 & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Within-group comparisons of the predictability (T2-T3) of expansion at canine, premolar, and molar levels. T2: predicted final width; T3: observed final width post-treatment. T2-T3(\(\%\)): percentage of final width not achieved by treatment. Relative predictability (\(\%\)) calculated as observed versus predicted amount of expansion (T3-T1 \(\times\) 100/ T2-T1). SD: standard deviation, \(\%\): percentage, CI: confidence interval, PRED: predicted, POST: post-treatment measure, T2: predicted outcome, T3: observed outcome, T1: baseline, mm: millimeters. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Between-Group**} & \multicolumn{2}{c}{**BILAT Vs. UNILAT**} & \multicolumn{2}{c}{**Single Tooth Vs. UNILAT**} & \multicolumn{2}{c}{**Single Tooth Vs. BILAT**} \\ \cline{3-10}  & \multirow{2}{*}{**Mean**} & \multicolumn{2}{c}{**95\% CI**} & \multicolumn{2}{c}{**95\% CI**} & \multicolumn{2}{c}{**95\% CI**} & \multicolumn{2}{c}{**95\% CI**} \\ \cline{3-10}  & & & **Lower Lim** & **Upper Lim** & **Difference** & **Lower Lim** & **Upper Lim** & **Difference** & **Lower Lim** & **Upper Lim** \\ \hline \multirow{3}{*}{