Add \cline{i-j) to add partial horizontal line beginning in column i and ending in column j

[murkle]

Examples

• https://tex.stackexchange.com/questions/368748/cline-overshoots-table-using-tabularx
• https://texblog.org/2012/12/21/multi-column-and-multi-row-cells-in-latex-tables/
• https://tex.stackexchange.com/questions/314025/making-stats-table-with-multicolumn-and-cline
• https://en.wikibooks.org/wiki/LaTeX/Tables

\begin{tabular}{lccccc c ccccc}
\hline
 & \multicolumn{5}{c}{Females} && \multicolumn{5}{c}{Males} \\
\cline{2-6} \cline{8-12}
Treatment     & V1   & V2  & V3 & V4 & V5 && V1   & V2  & V3 & V4 & V5 \\
Placebo       & 0.21 & 163 & 3  & 4  & 5  && 0.22 & 164 & 3  & 4  & 5  \\
ACE Inhibitor & 0.13 & 142 & 3  & 4  & 5  && 0.15 & 144 & 3  & 4  & 5  \\
Hydralazine   & 0.17 & 143 & 3  & 4  & 5  && 0.16 & 140 & 3  & 4  & 5  \\
\end{tabular}

\begin{tabular}{|r|l|}
  \hline
  7C0 & hexadecimal \\
  3700 & octal \\ \cline{2-2}
  11111000000 & binary \\
  \hline \hline
  1984 & decimal \\
  \hline
\end{tabular}