\begin{tabular}{l*{3}{c}}
\hline\hline
            &     Table 5&            &            \\
            &   Low-treat&  High-treat&        Diff\\
\hline
Pearson chi-squared&      24.629&       3.507&      21.121\\
p-val       &       0.000&       0.320&       0.000\\
Likelihood ratio&      24.891&       3.547&      21.343\\
p-val       &       0.000&       0.315&       0.000\\
Kendall rank correlation&       0.200&       0.112&       0.088\\
p-val       &       0.000&       0.190&       0.164\\
N           &     523.000&     121.000&     644.000\\
\hline\hline
\end{tabular}