{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{2}{c}}
\hline\hline
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}\\
            &\multicolumn{1}{c}{est}&\multicolumn{1}{c}{est}\\
\hline
female      &      0.0494         &      0.0509         \\
            &      (1.63)         &      (1.67)         \\
[1em]
age         &                     &     0.00532\sym{***}\\
            &                     &      (6.41)         \\
[1em]
\_cons      &       0.169\sym{***}&     0.00370         \\
            &     (20.87)         &      (0.15)         \\
\hline
\(N\)       &        2337         &        2337         \\
\hline\hline
\multicolumn{3}{l}{\footnotesize \textit{t} statistics in parentheses}\\
\multicolumn{3}{l}{\footnotesize \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\)}\\
\end{tabular}
}