\begin{tabular}{@{\extracolsep{5pt}} ccccccc}
  \\[-1.8ex]\hline 
  \hline \\[-1.8ex] 
ID & Demo & Gender & ABO Type & Age (years) & BMI (\si{\kg\per\m\squared}) & HLA-A2 Present \\
  \hline \\[-1.8ex]
4 & AA & M & NA & 27 & 21.7 & FALSE \\
24 & C & M & NA & 22 & 23.9 & FALSE \\
29 & AA & M & NA & 40 & 20.9 & TRUE \\
30 & AA & M & NA & 25 & 20.9 & TRUE \\
309 & C/PI & F & APOS & 22 & 24.9 & FALSE \\
338 & C & M & OPOS & 23 & 23.4 & TRUE \\
338 & C & M & OPOS & 24 & 23.4 & TRUE \\
358 & C & F & OPOS & 52 & 37.1 & TRUE \\
397 & C & M & OPOS & 53 & 31.2 & FALSE \\
512 & C & M & OPOS & 21 & 26.5 & FALSE \\
592 & H & M & APOS & 21 & 31.8 & FALSE \\
  \hline \\[-1.8ex]
\end{tabular}