Allora se non erro ti serve qualcosa come:
`
\documentclass[11pt, a4paper, twoside,openright]{book}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{array}
\usepackage{dcolumn}
\usepackage[singlelinecheck=true,font=small,labelfont=bf,textfont=sl]{caption}
\usepackage{multirow}
\usepackage{longtable}
\usepackage[pdftex]{rotating}
\usepackage{pdfpages}
\begin{document}
\begin{table}[p]
\begin{minipage}{\textwidth}
\centering
\caption{text} \label{text}
\small
\begin{tabular}{*2{m{.1\textwidth}}m{.15\textwidth}m{.08\textwidth}m{.24\textwidth}m{.16\textwidth}}
\toprule
\textbf{text $^a$} & \textbf{text} & \textbf{text} & \textbf{text} &\textbf{text} & \textbf{text}\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text & $^b$ & text &text\\
\midrule
text & text & text & $^b$ & text &text\\
\midrule
text & text & text & $^b$ & text &text\\
\bottomrule
\multicolumn{6}{l}{$^a$ text} \\
\multicolumn{6}{l}{$^b$ text}\\
\end{tabular}
\end{minipage}
\end{table}
\end{document}
`
in questo caso la nota b fuoriesce dal foglio mentre nel caso seguente con \footmarknote e \foottextnote:
`
\documentclass[11pt, a4paper, twoside,openright]{book}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{array}
\usepackage{dcolumn}
\usepackage[singlelinecheck=true,font=small,labelfont=bf,textfont=sl]{caption}
\usepackage{multirow}
\usepackage{longtable}
\usepackage[pdftex]{rotating}
\usepackage{pdfpages}
\begin{document}
\begin{table}[p]
\begin{minipage}{\textwidth}
\centering
\caption{text} \label{text}
\small
\begin{tabular}{*2{m{.1\textwidth}}m{.15\textwidth}m{.08\textwidth}m{.24\textwidth}m{.16\textwidth}}
\toprule
\textbf{text \footnotemark[1]} & \textbf{text} & \textbf{text} & \textbf{text} &\textbf{text} & \textbf{text}\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text & text & text &text\\
\midrule
text & text & text &\footnotemark[2] & text &text\\
\midrule
text & text & text & \footnotemark[2] & text &text\\
\midrule
text & text & text &\footnotemark[2] & text &text\\
\bottomrule
\footnotetext[1]{TEXT}
\footnotetext[2]{TEXT}
\end{tabular}
\end{minipage}
\end{table}
\end{document}
`
L’indice delle note e sbagliato