\begin{tabular}{*{2}{l}}
\hline
                  & M1   \tabularnewline
                   &Estimate \tabularnewline
                 &(S.E.) \tabularnewline
 \hline
 \hline
   (Intercept)     &951.121*** \tabularnewline
                 &(143.784)  \tabularnewline
   oldx            &126.882*** \tabularnewline
                 &(  9.866)  \tabularnewline
 \hline
 N                 &100       \tabularnewline
 RMSE             &282.609   \tabularnewline
 $R^2$             &0.628   \tabularnewline
 \hline
\hline
 
 \multicolumn{2}{c}{${*  p}\le 0.05$${*\!\!*  p}\le 0.01$${*\!\!*\!\!*  p}\le 0.001$}\tabularnewline
 \end{tabular}