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texdoc siunitx

       S[table-format=2.0,table-alignment=left] 

\documentclass[
  captions=tableabove,
  ngerman
]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{selinput}
\SelectInputMappings{
  agrave={à},
  eacute={é}
}
\usepackage{babel}
\usepackage{booktabs,multirow}
\usepackage{siunitx}

\begin{document}
  \begin{table}[!ht]
    \caption{Beschriftung der Tabelle}
    \label{tab:dummmy}
    \centering
    \begin{tabular}{
      S[table-format=2.0,table-alignment=left]
      S[table-format=2.1]
      S[table-format=1.1]
      S[table-format=1.1]
      S[table-format=3.0]
      S[table-format=2.0]
      S[table-format=1.1]
      S[table-format=2.1]
      S[table-format=1.1]
      S[table-format=1.1]
      S[table-format=3.0]
      S[table-format=2.0]
      S[table-format=1.1]
    } \toprule
      \multirow{2}{*}[-0.5ex]{Combination} &
      \multicolumn{3}{c}{Experiment 1} &
      \multicolumn{3}{c}{Experiment 2} &
      \multicolumn{6}{c}{Experiment 3} \\ \cmidrule(lr){2-4}\cmidrule(lr){5-7}\cmidrule(l){8-13}
                & {A} & {W} & {ID\textsubscript{t}} & {$\alpha$} & {$\omega$} & {ID\textsubscript{t}}
                & {A} & {W} & {ID\textsubscript{t}} & {$\alpha$} & {$\omega$} & {ID\textsubscript{t}} \\ \midrule
              1 &  4.8 & 0.6 & 3.1 &  40 &  3 & 3.8 & 12.7 & 0.8 & 4.1 &  50 &  4 & 3.8 \\
              2 &  4.8 & 1.3 & 2.2 &  40 &  6 & 2.9 & 12.7 & 1.6 & 3.2 &  50 &  4 & 3.8 \\
              3 &  4.8 & 1.9 & 1.8 &  40 &  9 & 2.4 &  4.8 & 0.8 & 2.8 &  50 &  4 & 3.8 \\
              4 &  4.8 & 2.5 & 1.5 &  40 & 12 & 2.1 &  4.8 & 1.6 & 2   &  50 &  4 & 3.8 \\
              5 &  9.5 & 0.6 & 4   &  80 &  3 & 4.8 & 12.7 & 0.8 & 4.1 &  50 & 12 & 2.4 \\
              6 &  9.5 & 1.3 & 3.1 &  80 &  6 & 3.8 & 12.7 & 1.6 & 3.2 &  50 & 12 & 2.4 \\
              7 &  9.5 & 1.9 & 2.6 &  80 &  9 & 3.3 &  4.8 & 0.8 & 2.8 &  50 & 12 & 2.4 \\
              8 &  9.5 & 2.5 & 2.2 &  80 & 12 & 2.9 &  4.8 & 1.6 & 2   &  50 & 12 & 2.4 \\
              9 & 14.3 & 0.6 & 4.6 & 120 &  3 & 5.4 & 12.7 & 0.8 & 4.1 & 130 &  4 & 5.1 \\
             10 & 14.3 & 1.3 & 3.6 & 120 &  6 & 4.4 & 12.7 & 1.6 & 3.2 & 130 &  4 & 5.1 \\
             11 & 14.3 & 1.9 & 3.1 & 120 &  9 & 3.8 &  4.8 & 0.8 & 2.8 & 130 &  4 & 5.1 \\
             12 & 14.3 & 2.5 & 2.7 & 120 & 12 & 3.5 &  4.8 & 1.6 & 2   & 130 &  4 & 5.1 \\
             13 & 19.1 & 0.6 & 5   & 160 &  3 & 5.8 & 12.7 & 0.8 & 4.1 & 130 & 12 & 3.6 \\
             14 & 19.1 & 1.3 & 4   & 160 &  6 & 4.8 & 12.7 & 1.6 & 3.2 & 130 & 12 & 3.6 \\
             15 & 19.1 & 1.9 & 3.5 & 160 &  9 & 4.2 &  4.8 & 0.8 & 2.8 & 130 & 12 & 3.6 \\
             16 & 19.1 & 2.5 & 3.1 & 160 & 12 & 3.8 &  4.8 & 1.6 & 2   & 130 & 12 & 3.6 \\
      {Minimum} &  4.8 & 0.6 & 1.5 &  40 &  3 & 2.1 &  4.8 & 0.8 & 2   &  50 &  4 & 2.4 \\
      {Maximum} & 19.1 & 2.5 & 5   & 160 & 12 & 5.8 & 12.7 & 1.6 & 4.1 & 130 & 12 & 5.1 \\ \bottomrule
    \end{tabular}
  \end{table}
\end{document}

\begin{table}[!h]
  \centering
 \begin{tabularx}{\textwidth}{XXXXXXXXXXXX} 
	 \toprule
	  \multicolumn{3}{c}{\centering\tabhead{}} &
      \multicolumn{3}{c}{\centering\tabhead{A}} &
      \multicolumn{3}{c}{\centering\tabhead{B}} &
      \multicolumn{3}{c}{\centering\tabhead{C}}\\
	 \cmidrule(r){4-6} \cmidrule(r){7-9} \cmidrule(r){10-12}  \multicolumn{3}{c}{Kombination}  &   AA & BB &  CC &   DD & EE & FF &  GG & HH & II \\ \midrule
	  \multicolumn{3}{l}{1} & AAA & BBB & CCC & DDD & EEE & FFF & GGG  & HHH & III\\
 \bottomrule
  \end{tabularx}
  \caption{Caption}
  \label{tab:tabells}
\end{table}