## 3 Results  
Table 1 shows the patients' age, and Table 2 shows the calculated EDs for the pediatric CT procedures. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**CT Procedure** & **Age (Years)** & **Average** & **Max** & **Min** & **SD** \\ \hline \multirow{4}{*}{Head} & \(<\)1 & 0.35 & 0.92 & 0.006 & 0.27 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 2.5 & 4 & 1 & 1.12 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 7 & 9 & 5 & 1.35 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 12 & 14 & 10 & 1.14 \\ \hline \multirow{4}{*}{Chest} & \(<\)1 & 0.19 & 0.8 & 0.008 & 0.21 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 2.5 & 4 & 1 & 1.04 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 7.2 & 9 & 5 & 1.28 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 11.8 & 14 & 10 & 1.28 \\ \hline \multirow{4}{*}{Abdomen} & \(<\)1 & 0.4 & 0.9 & 0.019 & 0.31 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 2.8 & 4 & 1 & 1.09 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 6.8 & 9 & 4 & 1.36 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 11.5 & 13 & 10 & 0.91 \\ \hline \multirow{4}{*}{AP} & \(<\)1 & 0.28 & 0.9 & 0.003 & 0.33 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 2.9 & 4 & 1 & 0.99 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 7.8 & 9 & 6 & 1.14 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 12.5 & 14 & 11 & 1.05 \\ \hline \multirow{4}{*}{CAP} & \(<\)1 & 0.34 & 0.9 & 0.019 & 0.28 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 2.9 & 4 & 1 & 0.96 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 7.2 & 9 & 5 & 1.31 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 11.8 & 14 & 10 & 1.15 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Pediatric age distributions for CT procedures. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**CT Procedure**} & \multirow{2}{*}{**Age (Years)**} & \multicolumn{4}{c}{**ED (mSv)**} \\ \cline{3-6}  & & **Average** & **Max** & **Min** & **SD** \\ \hline \multirow{4}{*}{Head} & \(<\)1 & 4.8 & 10.12 & 3.7 & 1.4 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 3.64 & 6.6 & 2.87 & 1 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 2.5 & 4.5 & 0.416 & 1 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 2.96 & 6.9 & 0.84 & 1.4 \\ \hline \multirow{4}{*}{Chest} & \(<\)1 & 1.93 & 4.49 & 0.64 & 1 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 1.51 & 4.42 & 0.6 & 0.9 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 1.91 & 3.24 & 0.88 & 0.8 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 2.05 & 4.78 & 0.8 & 0.8 \\ \hline \multirow{4}{*}{Abdomen} & \(<\)1 & 6.3 & 17.8 & 1.67 & 3.5 \\ \cline{2-6}  & \(1\leq\) to \(<\) 5 & 4.4 & 8.4 & 2.37 & 1.6 \\ \cline{2-6}  & \(5\leq\) to \(<\) 10 & 3.84 & 6.1 & 2.08 & 1.2 \\ \cline{2-6}  & \(10\leq\) to \(\leq\) 15 & 2.77 & 4.98 & 1.55 & 1.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Calculated EDs for the pediatric CT procedures. Table 3 shows the proposed DRLs for the pediatric CT procedures obtained in this study. Tables 4-6 shows comparisons between the results obtained in this study (i.e., EDs and DRLs) and results found in the literature. \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**CT Procedure**} & \multirow{2}{*}{**Age (Years)**} & \multicolumn{8}{c}{**ED (mSv)**} \\ \cline{3-11}  & & & **Average** & **Max** & **Min** & **SD** \\ \hline \multirow{4}{*}{AP} & \(<\)1 & 4.03 & 5.88 & 1.1 & 0.9 \\ \cline{2-11}  & \(1\leq\) to \(<\) 5 & 4.6 & 12.66 & 2.68 & 2.1 \\ \cline{2-11}  & \(5\leq\) to \(<\) 10 & 3.84 & 7.24 & 1.36 & 1.4 \\ \cline{2-11}  & \(10\leq\) to \(\leq\) 15 & 3.2 & 4.95 & 1.85 & 0.8 \\ \hline \multirow{4}{*}{CAP} & \(<\)1 & 3.49 & 6.47 & 1.64 & 1.3 \\ \cline{2-11}  & \(1\leq\) to \(<\) 5 & 4.57 & 6.22 & 1.12 & 1.1 \\ \cline{2-11}  & \(5\leq\) to \(<\) 10 & 4.07 & 6.37 & 2.7 & 1.1 \\ \cline{2-11}  & \(10\leq\) to \(\leq\) 15 & 4.02 & 5.94 & 2.62 & 1.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: _Cont._