
\begin{center}
\begin{longtable}{ll}
\caption{Classification system for the response variable. \label{CI:scores}}
\\
Classification & Endoscopy Examination \\ \hline
1 & No visible lesions \\
2 & One haemorrhage or erosion \\
3 & 2-10 haemorrhages or erosions \\
4 & 11-25 haemorrhages or erosions \\
5 & More than 25 haemorrhages or erosions \\ 
  & or an invasive ulcer of any size\\ \hline
\end{longtable}
\end{center}
