# Effect of Genetic and Environmental Factors on the Impaction of Lower Third Molars
## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**Dizygotic Twins**} & \multicolumn{4}{c}{**Monozygotic Twins**} \\ \cline{2-9}
**Description** & **First** & **Second** & **Significance** & **Pearson** & **First** & **Second** & **Significance** \\
**of the Angle** & **Dizygotic** & **Dizygotic** & **of Differences** & **Coefficient** & **Monozygotic** & **Monozygotic** & **of Differences** \\
**Twin** & **Twin** & **(_p_ Value)** & **Siblings** & **Twin** & **Twin** & **Twin** & **(_p_ Value)** \\ \hline LR8/MND (mean \(\pm\) SD) & 109.62 \(\pm\) 24.65 & 111.84 \(\pm\) 18.71 & 0.11 & 0.41 * & 107.15 \(\pm\) 23.65 & 108.31 \(\pm\) 20.83 & 0.69 \\ \hline LR8/OKL (mean \(\pm\) SD) & 55.01 \(\pm\) 18.01 & 57.23 \(\pm\) 19.75 & 0.45 & 0.28 * & 54.95 \(\pm\) 17.56 & 56.48 \(\pm\) 17.01 & 0.95 \\ \hline LR8/HP (mean \(\pm\) SD) & 48.72 \(\pm\) 16.88 & 47.32 \(\pm\) 17.7 & 0.25 & 0.36 * & 45.38 \(\pm\) 16.34 & 47.15 \(\pm\) 17.98 & 0.61 \\ \hline LL8/MND (mean \(\pm\) SD) & 105.93 \(\pm\) 29.47 & 108.36 \(\pm\) 24.74 & 0.12 & 0.38 * & 106.08 \(\pm\) 21.51 & 107.51 \(\pm\) 22.54 & 0.67 \\ \hline LL8/OKL (mean \(\pm\) SD) & 55.46 \(\pm\) 18.78 & 60.95 \(\pm\) 21 & 0.42 & 0.29 * & 57.73 \(\pm\) 16.14 & 56.28 \(\pm\) 17.65 & 0.43 \\ \hline LL8/HP (mean \(\pm\) SD) & 49.68 \(\pm\) 20.28 & 48.41 \(\pm\) 17.05 & 0.44 & 0.41 * & 48.69 \(\pm\) 17.93 & 48.07 \(\pm\) 18.8 & 0.56 \\ \hline LR7/MND (mean \(\pm\) SD) & 90.71 \(\pm\) 8.26 & 94.18 \(\pm\) 8.58 & 0.25 & 0.39 * & 93.71 \(\pm\) 9.27 & 94.29 \(\pm\) 9.79 & 0.98 \\ \hline LR7/HP (mean \(\pm\) SD) & 80.51 \(\pm\) 12.42 & 63.61 \(\pm\) 6.97 & 0.1 & 0.38 * & 67.25 \(\pm\) 10.81 & 67.97 \(\pm\) 9.86 & 0.46 \\ \hline LL7/HP (mean \(\pm\) SD) & 67.68 \(\pm\) 11.03 & 66.36 \(\pm\) 6.39 & 0.78 & 0.39 * & 68.77 \(\pm\) 9.45 & 68.93 \(\pm\) 9.05 & 0.58 \\ \hline LL7/MND (mean \(\pm\) SD) & 92.79 \(\pm\) 10.29 & 93.87 \(\pm\) 7.3 & 0.87 & 0.38 * & 83.08 \(\pm\) 9.67 & 83.11 \(\pm\) 9.75 & 0.98 \\ \hline LR6/MND (mean \(\pm\) SD) & 84.77 \(\pm\) 6.36 & 84.99 \(\pm\) 5.38 & 0.56 & 0.41 * & 80.84 \(\pm\) 12.1 & 80.84 \(\pm\) 12.14 & 0.99 \\ \hline LL6/MND (mean \(\pm\) SD) & 83.24 \(\pm\) 6.61 & 84.2 \(\pm\) 6 & 0.79 & 0.40 * & 81.98 \(\pm\) 9.41 & 81.72 \(\pm\) 9.39 & 0.99 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The distribution of the teeth angulations among dizygotic and monozygotic twins (* \(p\) \(<\) 0.05). \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Description of the Variable**} & \multicolumn{2}{c}{**Dizygotic Twins**} & \multicolumn{2}{c}{**Monozygotic Twins**} \\ \cline{2-5}  & **LES-R (Mean \(\pm\) SD)** & **LES-L (Mean \(\pm\) SD)** & **LES-R (Mean \(\pm\) SD)** \\ \hline First twin in the pair & 11.21 \(\pm\) 3.26 & 12.04 \(\pm\) 3.26 & 11.15 \(\pm\) 2.96 \\ \hline Second twin in the pair & 10.98 \(\pm\) 3.14 & 11.15 \(\pm\) 3.45 & 11.06 \(\pm\) 2.77 \\ \hline Significance of differences (\(p\) value) & 0.14 & 0.17 & 0.23 \\ \hline Pearson correlation coefficient between siblings & 0.53 * & 0.60 * & 0.91 * \\ \hline \hline \end{tabular}
\end{table} 
Table 2: The eruption space for the lower third molars. LES-R—the space for the lower right third molar; LES-L—the space for the lower left third molar (* \(p\) \(<\) 0.05).