Code: Select all
\usepackage{threeparttable}
\begin{table}
\centering
\begin{threeparttable}
\caption{Caption}
\begin{tabular}{|c|c|c|c|c|c|}
\hline
\multicolumn{1}{|c|}{\multirow{2}{*}{\textbf{AAAAA}}}&
\multicolumn{1}{c|}{\multirow{2}{*}{\textbf{BBBBB}}}&
\multicolumn{2}{c|}{\textbf{CCCCC}} &
\multicolumn{2}{c|}{\textbf{DDDDDDDD}}\bigstrut\\
\cline{3-6}
& & $a > b$ & $b > a$ & $a > b$ & $b > a$\\
\hline
P & S & 10\tnote{1} & 10 & 10 & 10 \\
Q & T & 10 & 10 & 10 & 10 \\
\hline
\end{tabular}
\begin{tablenotes}
\item[1] Note.
\end{tablenotes}
\end{threeparttable}
\end{table}
Thank you in advance.