documentclass{book}
usepackage{multirow,bigdelim}
begin{document}
begin{tabular}{cc}
hline
Sample values: each line contains one entire beat)tabularnewline
hline
68.1 72.8 78.4 85.6 93.6 98.1 95.3 91.2 91.1 ... & rdelim{{3}{3mm}[variable length] tabularnewline
74.4 79.2 85.6 92.8 100.8 108.8 115.2 121.6 ...tabularnewline
73.6 77.6 84.0 91.2 100.0 108.8 117.6 124.8 ...tabularnewline
hline
end{tabular}
end{document}