\begin{tabular}{@{\extracolsep{5pt}}lc}
  \\[-1.8ex]\hline 
  \hline \\[-1.8ex] 
  \\[-1.8ex] & DMS Fraction (\%) \\ 
  \hline \\[-1.8ex] 
  Intercept & 0.136$^{*}$ \\ 
  Initial Cell Number & 0.00000 \\ 
  \hline \\[-1.8ex] 
  R$^{2}$ & 0.186 \\ 
  Adjusted R$^{2}$ & $-$0.086 \\ 
  \hline 
  \hline \\[-1.8ex] 
  \textit{Note:}  & \multicolumn{1}{r}{$^{*}$p$<$0.1; $^{**}$p$<$0.05; $^{***}$p$<$0.01} \\ 
\end{tabular} 