## 3 Results
### Operative, Interventional and Medical Treatment Status  
Of these, 2 (3.4%) were native, 41 (69.5%) primarily postoperative, and 16 (27.2%) primarily postinterventional (Table 4). \begin{table}
\begin{tabular}{c c c c c} \hline Age Group & \begin{tabular}{c} **Mild Underweight (BMI \\ **17-18.5 kg/m3**) \\ \end{tabular} & \begin{tabular}{c} **Moderate Underweight (BMI \\ **16-16.9 kg/m3**) \\ \end{tabular} & \
\begin{tabular}{c} **Severe Underweight (BMI \textless{}** \\ **16 kg/m3**) \\ \end{tabular} &
\begin{tabular}{c} **\(p\)-Value** \\ \end{tabular} \\ \hline
**18-24 (n = 18)** & 12 (32.4\%) & 2 (18.2) & 4 (36.4\%) & \\
25-34 (n = 22) & 10 (27.0\%) & 6 (54.5\%) & 6 (54.5\%) & 0.381 \\
35-44 (n = 13) & 10 (27.0\%) & 2 (18.2\%) & 1 (9.1\%) & - \\
45-54 (n = 5) & 4 (10.8\%) & 1 (9.1\%) & - & - \\
55+ (n = 1) & 1 (2.7\%) & - & - & - \\ \hline  & 37 (62.7\%) & 11 (18.6\%) & 11 (18.6\%) & \\ \hline \end{tabular}
\end{table} 
Table 2: BMI-Classification by age group. \begin{table}
\begin{tabular}{c c c c c} \hline Age Group & \begin{tabular}{c} **Mild** \\ **Underweight (BMI 17-18.5 kg/m3)** \\ \end{tabular} & \begin{tabular}{c} **Moderate Underweight (BMI \\ **16-16.9 kg/m3**) \\ \end{tabular} & \
\begin{tabular}{c} **Severe Underweight (BMI \textless{}** \\ **16 kg/m3**) \\ \end{tabular} &
\begin{tabular}{c} **Metabolic** \\ **Body Weight** \\ \end{tabular} \\ \hline Aortic valve disease (n = 2) & 2 (100\%) & - & - & 43.5 \(\pm\) 4.2 \\ \(\circ\)TGA (n = 2) & 2 (100\%) & - & 41.3 \(\pm\) 5.3 \\ DIIV (n = 3) & 2 (66.6\%) & 1 (33.3\%) & - & 37.5 \(\pm\) 1.5 \\ Ebisetin (n = 5) & 4 (80\%) & - & 1 (20\%) & 37.8 \(\pm\) 5.2 \\ Eisenemger (n = 3) & 2 (66.6\%) & - & 1 (33.3\%) & 32.8 \(\pm\) 6.1 \\ HLHS (n = 2) & 2 (100\%) & - & 45.2 \(\pm\) 3.0 \\ Marfan Syndrome (n = 16) & 8 (50\%) & 4 (25\%) & 4 (25\%) & 43.2 \(\pm\) 5.6 \\ PA intact VS (n = 1) & 1 (100\%) & - & - & 27.8 \\ PA-VSD (n = 5) & 3 (60\%) & 1 (20\%) & 1 (20\%) & 30.2 \(\pm\) 3.6 \\ Puk (n = 1) & - & 1 (100\%) & - & 34.5 \\ Shone complex (n = 1) & 1 (100\%) & - & - & 37.5 \\ TGA (n = 3) & 1 (33.3\%) & 1 (33.3\%) & 1 (33.3\%) & 39.5 \(\pm\) 4.8 \\ TOF (n = 9) & 6 (66.6\%) & 1 (11.1\%) & 2 (22.2\%) & 36.8 \(\pm\) 7.6 \\ TA (n = 1) & 1 (100\%) & - & - & 31.5 \\ UVH (n = 2) & 2 (100\%) & - & - & 40.1 \(\pm\) 2.7 \\ VSD (n = 3) & 2 (66.6\%) & - & 1 (33.3\%) & 35.5 \(\pm\) 8.3 \\ \hline  & & & & \\ \end{tabular}
\end{table} 
Table 3: The association between underlying congenital heart defect and the extent of underweight. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**ID** & **Age** & **Sex** & **BMI** & **Met. BW** & \begin{tabular}{c} **Type** \\ **of** \\ **CHD** \\ \end{tabular}  & \ \begin{tabular}{c} **Native/** \\ **Post OP/** \\ **Post** \\ **Intervention** \\ \end{tabular}  & \begin{tabular}{c} **Cardiac Medication** \\ **Medication** \\ **Intervention** \\ \end{tabular}  \\ \hline
001-0020 & 35–44 & female & 18.5 & 17.37 & PA-VSD & Post-OP & \begin{tabular}{c} Beta blockers \\ ACE-1 \\ Aldosterone antagonist \\ Oral Anticoagulant \\ \end{tabular}  \\ \hline
001-0061 & 25–34 & male & 15.2 & 16.79 & PA-VSD & Post-OP & \begin{tabular}{c} ACE-1 \\ Aldosterone antagonist \\ Antarrhythmica \\ Oral Anticoagulant \\ \end{tabular}  \\ \hline
001-0114 & 18–24 & male & 17.8 & 19.36 & DILV & Post-OP & \begin{tabular}{c} Beta blockers \\ ATB \\ Oral Anticoagulant \\ \end{tabular}  \\ \hline
001-0126 & 25–34 & female & 17.1 & 17.37 & Eisenemenger & Native & \begin{tabular}{c} PDE-1 \\ **Post** \\ **Out** \\ \end{tabular}  \\ \hline
001-0149 & 35–44 & male & 18.0 & 19.92 & \ \begin{tabular}{c} Aortic valve \\ disease \\ \end{tabular}  & Post-OP & \begin{tabular}{c} Beta blockers \\ ATB \\ **Out** \\ \end{tabular}  \\ \hline
001-0217 & 25–34 & female & 16.3 & 18.80 & ccTGA & Post-OP & \begin{tabular}{c} Beta blockers \\ **Adosterone antagonist \\ Oral Anticoagulant** \\ \end{tabular}  \\ \hline
001-0392 & 25–34 & male & 18.4 & 18.80 & SingleVentric & Post-OP & \begin{tabular}{c} Beta blockers \\ ACE-1 \\ **Out** \\ \end{tabular}