How to draw a side line in table

Question

\documentclass{article}
\usepackage{tabularx}
\usepackage{multirow}
\begin{document}

\begin{table}[h!]
\setlength\extrarowheight{2pt} % for a ever so slightly more open "look"
    \begin{tabularx}{\textwidth}{c X | c | c | c |}
    \cline{3-5}
    &  & \multicolumn{3}{c|}{Paired Differences} \\
    \cline{3-5}
     & & Mean &  Std. Deviation & Std. Error Mean \\
         \hline
    Pair 1 & Testing 1 and Testing 2 and Testing 3 & 4.20\% & 44.6\% & 4.54\%  \\
    \hline
      \end{tabularx}
\caption{Testing 123}
\end{table}

\end{document}

Outcome:

I cannot figure out. If I added \begin{tabularx}{\textwidth}{|c X | c | c | c |} It will not be working

Try \multicolumn{1}{|c}{Pair 1} or just add it to the main column description and use \multicolumn to remove it where not wanted. — John Kormylo, Aug 03 '19 at 14:41
On an completely unrelated note: with booktabs your table looks better: https://pastebin.com/r38axb1c. If you'd like to vertically center the cells, look into https://tex.stackexchange.com/questions/7208/how-to-vertically-center-the-text-of-the-cells. — Oleg Lobachev, Aug 03 '19 at 15:27
@Sveinung It is different pattern. I had tried \multicolumn{1}{|c|}{Testing123 Testin123 Testing123 Testin123}. following the suggestion on this page, but it came out out of width. — aan, Aug 05 '19 at 11:01

Zarko · Accepted Answer · 2019-08-04T18:51:45.727

like this?

\documentclass{article}
\usepackage{multirow, tabularx}
\usepackage{xparse}
\NewExpandableDocumentCommand\mcc{O{1}m}
    {\multicolumn{#1}{c|}{#2}}
\usepackage{siunitx}     \begin{document}
    \begin{table}[ht]
\setlength\extrarowheight{2pt} % for a ever so slightly more open "look"
    \begin{tabularx}{\linewidth}{|c X |                % <---
                             *{3}{S[table-format=2.2,  % <---
                                    table-space-text-post=\,\%]<{\,\%}|}} 
    \cline{3-5}
\mcc[2]{} % <---
        & \mcc[3]{Paired Differences}       \cr
    \cline{3-5}
\mcc[2]{} % <---
        & \mcc{Mean} & \mcc{Std. Deviation} & \mcc{Std. Error Mean} \cr
         \hline
Pair 1 & Testing 1 and Testing 2 and Testing 3
        & 4.20  & 44.6  & 4.54                          \cr
    \hline
      \end{tabularx}
\caption{Testing 123}
    \end{table}
\end{document}

Addendum: Less sophisticated version of above answer is:

\documentclass{article}
\usepackage{multirow, tabularx}
\usepackage{siunitx}     


\begin{document}
    \begin{table}[ht]
\setlength\extrarowheight{2pt} % for a ever so slightly more open "look"
    \begin{tabularx}{\linewidth}{|c X |                % <---
                             *{3}{S[table-format=2.2,  % <---
                                    table-space-text-post=\,\%]<{\,\%}|}}
    \cline{3-5}
\multicolumn{2}{c|}{} 
        & \multicolumn{3}{c|}{Paired Differences}               \cr
    \cline{3-5}
\multicolumn{2}{c|}{} 
        & \multicolumn{1}{c|}{Mean} 
                & \multicolumn{1}{c|}{Std. Deviation} 
                        & \multicolumn{1}{c|}{Std. Error Mean}  \cr
         \hline
Pair 1 & Testing 1 and Testing 2 and Testing 3
        & 4.20  & 44.6  & 4.54                                  \cr
    \hline
      \end{tabularx}
\caption{Testing 123}
    \end{table}
\end{document}

where S column type is defined in siunitx package. Details of its options and use see the package documentation, (sub)section 5.14 Tabular material, pp 44. Short summary:

in tabular preamble are defined number of columns their types:
- c column type center cells contents (and it is wide as text is long)
- X column type exist in tabularx table environment. It width is calculate by package, contents in it is set as paragraph, meaning that automatically break lines
- vertical bars | define vertical lines in table. It are present in all cells which are not overwrite with \multicolumn cells.
\multicolumn command merge adjacent cells into one cell (or define new column type for single cells)
table-format=2.2 means <integer part>.<decimal part> of number. Numbers in column are aligned at decimal point
table-space-text-post=\,\% determine additional to horizontal space after number (reserved for small space \, and symbol %

For more information I strongly encourage you to read some introductory text about table writing. For example Wiki book: Tables and of course in the packages documentations. They are part of your LaTeX installation (in latex/doc folder) or they are available on CTAN archive.

Concerning the original answer: - package xparse (stored in doc/generic folder, as stated in its document documentation is:

The xparse package provides a high-level interface for producing document-level commands. In that way, it is intended as a replacement for the LATEX 2ε \newcommand macro. However, xparse works so that the interface to a function (optional arguments, stars and mandatory arguments, for example) is separate from the internal implementation. xparse provides a normalised input for the internal form of a function, independent of the document-level argument arrangement.

so with \NewExpandableDocumentCommand\mcc{O{1}m}{...} is defined new command which enable witting shorter code. For example:

O{1} is option 1 (in our case number of columns. Is option is not used, number of columns is 1 . m is mandatory argument, which in our case is a text in the multi column cell.
example of its uses are:
- \mcc{text} is defined as equivalent to code \multicolumn{1}{c|}{text} (see preamble in original answer)
- \mcc[r]{text over three columns} is equivalent for \multicolumn{3}{c|}{text over three columns}`

Thanks! Worked well. One question, how to cancel off the verticle line between the Pair 1 and Testing 1 and testing 2 and testing 3? — aan, Aug 04 '19 at 16:33
@user193541, just remove | between c and X column type. See corrected answer. — Zarko, Aug 04 '19 at 16:42
Thanks. Hard to understand what \mcc doing. It is well very done. — aan, Aug 04 '19 at 16:53
@user193541, mcc is new command with optional number of spanned columns (if it bigger than 1) for short writing \multicolumn{<number of spanned columns>}{c|}{< text in cell>}. Defined is by help of `xparse˙package. if answer solve your problem, you can accept it ;-). — Zarko, Aug 04 '19 at 17:12
Thanks, what does *{3}{S[table-format=2.2, % <--- table-space-text-post=\,\%]<{\,\%}|}} means? — aan, Aug 04 '19 at 17:22
@user193541, it defines three S columns' type, which enables align numbers in columns at their decimal points. For details see siunitx package documentation, subsection 5.14 Tabular material. — Zarko, Aug 04 '19 at 17:39

How to draw a side line in table

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