\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Subgroup Effects: Sociocultural Variables \label{tab:natl}}
\begin{tabular}{l*{2}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}\\
                    &\multicolumn{1}{c}{Base}&\multicolumn{1}{c}{Full}\\
                    &        b/se         &        b/se         \\
\hline
Treatment $\times$ Exports $\times$ High Nationalism&     -17.682         &      -5.950         \\
                    &    (25.563)         &    (24.079)         \\
Treatment $\times$ Imports $\times$ High Nationalism&      30.543         &      36.721         \\
                    &    (30.010)         &    (29.382)         \\
Treatment $\times$ Non-traded $\times$ High Nationalism&     -45.980\sym{**} &     -36.141\sym{*}  \\
                    &    (14.770)         &    (14.273)         \\
\hline
N                   &        2415         &        2273         \\
r2                  &       0.075         &       0.095         \\
\hline\hline
\multicolumn{3}{l}{\footnotesize \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\)}\\
\end{tabular}
\end{table}
