## 3 Results
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**CT**} & \multirow{2}{*}{**Study**} & \multicolumn{4}{c}{**Age (Years, DLP)**} \\ \cline{3-6}  & & **\textless{}1** & **1 \(\leq\) to \textless{} 5** & **5 \(\leq\) to \textless{} 10** & **10 \(\leq\) to \textless{} 15** \\ \hline \multirow{4}{*}{Head} & This study & 414 & 505 & 604 & 1031 \\ \cline{2-6}  & USA (2) [29] & 344 & — & — & — \\ \cline{2-6}  & Europe [20] & 385 & 505 & — & — \\ \cline{2-6}  & Japan [33] & 480 & 660 & 850 & 1000 \\ \cline{2-6}  & Germany [34] & 300 & 450 & 650 & 800 \\ \hline \multirow{4}{*}{Chest} & This study & 44.9 & 57.45 & 95.55 & 160 \\ \cline{2-6}  & USA (2) [29] & 60 & — & 110 & — \\ \cline{2-6}  & Europe [20] & — & — & — & — \\ \cline{2-6}  & Japan [33] & 70 & 95 & 175 & 230 \\ \cline{2-6}  & Germany [34] & — & 55 & 110 & 200 \\ \cline{2-6}  & France [35] & 26 & 40 & 56 & 116 \\ \hline \multirow{4}{*}{Abdomen} & This study & 94 & 127 & 175.5 & 154.5 \\ \cline{2-6}  & France [35] & 65 & 77 & 164 & 258 \\ \cline{2-6}  & International [36] & 130 & 250 & 310 & 460 \\ \cline{2-6}  & China [37] & 181.1 & 258 & 347.9 & 556.8 \\ \hline \multirow{4}{*}{AP} & This study & 76.65 & 130.2 & 163.5 & 210.2 \\ \cline{2-6}  & USA (2) [29] & 60 & 100 & 170 & 368 \\ \cline{2-6}  & Europe [20] & — & — & 150 & 210 \\ \cline{2-6}  & Japan [33] & 110 & 190 & 265 & 450 \\ \cline{2-6}  & Germany [34] & — & — & 185 & 310 \\ \hline \multirow{4}{*}{CAP} & This study & 83 & 176.5 & 190.1 & 265 \\ \cline{2-6}  & USA (2) [29] & 89 & 109 & 204 & 437 \\ \cline{1-1} \cline{2-6}  & Malaysia [27] & 98.1 & 150.2 & 292.6 & 644.9 \\ \cline{1-1} \cline{2-6}  & Jordan [38] & 248.4 & 530 & 524 & — \\ \cline{1-1} \cline{2-6}  & South Africa [39] & — & 215 & 235 & 285 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Comparisons between the proposed DRLs for the DLP and the DRLs found in the literature. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**CT**} & \multirow{2}{*}{**Study**} & \multicolumn{4}{c}{**Age (Years, CDTl\({}_{\textless{}1}\))**} \\ \cline{3-6}  & & **\textless{}1** & **1 \(\leq\) to \textless{} 5** & **5 \(\leq\) to \textless{} 10** & **10 \(\leq\) to \textless{} 15** \\ \hline \multirow{4}{*}{Head} & This study & 414 & 505 & 604 & 1031 \\ \cline{2-6}  & USA (2) [29] & 344 & — & — & — \\ \cline{2-6}  & Europe [20] & 385 & 505 & — & — \\ \cline{2-6}  & Japan [33] & 480 & 660 & 850 & 1000 \\ \cline{2-6}  & Germany [34] & 300 & 450 & 650 & 800 \\ \hline \multirow{4}{*}{Chest} & This study & 44.9 & 57.45 & 95.55 & 160 \\ \cline{2-6}  & USA (2) [29] & 60 & — & 110 & — \\ \cline{2-6}  & Europe [20] & — & — & — & — \\ \cline{2-6}  & Japan [33] & 70 & 95 & 175 & 230 \\ \cline{2-6}  & Germany [34] & — & 55 & 110 & 200 \\ \cline{2-6}  & France [35] & 26 & 40 & 56 & 116 \\ \hline \multirow{4}{*}{Abdomen} & This study & 94 & 127 & 175.5 & 154.5 \\ \cline{2-6}  & France [35] & 65 & 77 & 164 & 258 \\ \cline{2-6}  & International [36] & 130 & 250 & 310 & 460 \\ \cline{2-6}  & China [37] & 181.1 & 258 & 347.9 & 556.8 \\ \hline \multirow{4}{*}{AP} & This study & 76.65 & 130.2 & 163.5 & 210.2 \\ \cline{2-6}  & USA (2) [29] & 60 & 100 & 170 & 368 \\ \cline{2-6}  & Europe [20] & — & — & 150 & 210 \\ \cline{2-6}  & Japan [33] & 110 & 190 & 265 & 450 \\ \cline{2-6}  & Germany [34] & — & — & 185 & 310 \\ \hline \multirow{4}{*}{CAP} & This study & 83 & 176.5 & 190.1 & 265 \\ \cline{2-6}  & USA (2) [29] & 89 & 109 & 204 & 437 \\ \cline{1-1} \cline{2-6}  & Malaysia [27] & 98.1 & 150.2 & 292.6 & 644.9 \\ \cline{1-1} \cline{2-6}  & Jordan [38] & 248.4 & 530 & 524 & — \\ \cline{1-1} \cline{2-6}  & South Africa [39] & — & 215 & 235 & 285 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: _Cont._