{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{1}{ccc}}
\hline\hline
                    &\multicolumn{3}{c}{(1)}               \\
                    &\multicolumn{3}{c}{}                  \\
                    &        mean&          sd&         max\\
\hline
Distance (in miles) &        8.27&        5.14&       25.37\\
\hline\hline
\end{tabular}
}