Alignment in tabularx using exp. siunitx

Question

It's never ending story about that -> previous post. Simply, I just want to align to 'pm' sign my number columns. I've already tried replacing headers {l | l *{2}{>{\centering\arraybackslash}X}} with {l | l l l *{2}{>{\centering\arraybackslash}X} and than to check one column with siunitx: {l | l S[table-align-uncertainty, separate-uncertainty=true] l l *{2}{>{\centering\arraybackslash}X} but it doesn't work at all.

MWE:

\documentclass{article}
\usepackage{float, enumitem, amsmath}
\usepackage{rotating}  
\usepackage{booktabs, makecell, multirow, tabularx, threeparttable}
\renewcommand\theadfont{\small\bfseries}
\renewcommand\theadgape{} 
\usepackage{colortbl, color} %I preffer that instead of xcolor because xcolor give me errors with beamer
\usepackage{caption}
\captionsetup{belowskip=-5pt}
\captionsetup[table]{justification=raggedright,singlelinecheck=off}

\begin{document}

   \begin{table} 
    \centering
    \settowidth\rotheadsize{\theadfont Description 3 }
    \renewcommand\arraystretch{1.1}
\caption{Simple caption.}
\label{tab:setTag}
\begin{tabularx}{\linewidth}{l | l *{2}{>{\centering\arraybackslash}X}}
    \Xhline{1pt}
    & \thead[l]{Results} 
        & \thead{Method 1} & \thead{Method 2}           \\
    \Xhline{0.7pt}
    &   & \multicolumn{2}{c}{First section}             \\ 
    \Xcline{3-4}{0.6pt}
\multirow{3}{*}{\rothead{Description 1}}
    &Very long name & $11,5 \pm 0,5$ & $444,34 \pm 71,9$ \\
    & Very long name & $109,2 \pm 75,3$ & $2,8 \pm 664,36$ \\
    & Very long name& $9438 \pm 8$ & $256,0 \pm 98,1$ \\
    & Very long name & $11,5 \pm 0,5$ & $444,34 \pm 71,9$ \\
    & Very long name & $109,2 \pm 75,3$ & $2,8 \pm 664,36$ \\
    & Very long name & $9438 \pm 8$ & $256,0 \pm 98,1$ \\
    \end{tabularx}
    \end{table}
\end{document}

---

I've changed header to \begin{tabularx}{\linewidth}{l | X S[table-align-uncertainty, separate-uncertainty=true] S[table-align-uncertainty, separate-uncertainty=true]*{2}{>{\centering\arraybackslash}}} and data from first row to 11,5(5) & 444,34(719 and I get that result (strange Methods headers):

---

I've now had errors with array package '>{}' at wrong position. Can someone please tell me which one is the correct one? And another one with 'missing # inserted in alignment preamble' and the third one 'missing $ inserted' but I don't know why because it shows line with \end{tabularx}.

New part of the code:

\begin{tabularx}{\linewidth}{l | X S[table-align-uncertainty, separate-uncertainty=true] S[table-align-uncertainty, separate-uncertainty=true]*{2}{>{\centering\arraybackslash}}}
    \Xhline{1pt}
    & \thead[l]{Results} 
        & {\thead{Method 1}} & {\thead{Method 2}}           \\
    \Xhline{0.7pt}
    &   & \multicolumn{2}{c}{First section}             \\ 
    \Xcline{3-4}{0.6pt}
\multirow{3}{*}{\rothead{Description 1}}
    &Very long name & $11,5(5)$ & $444,34(719)$ \\
    & Very long name & $109,2(753)$ & $2,8(63)$ \\
    & Very long name& $9438(8)$ & $256,0(981)$ \\
    &Very long name & $11,5(5)$ & $444,34(719)$ \\
    & Very long name & $109,2(753)$ & $2,8(63)$ \\
    & Very long name& $9438(8)$ & $256,0(981)$ \\
    \end{tabularx}

It shows (which is obviously not align):

---

Answer 1

The following should work:

\documentclass{article}
\usepackage{float, enumitem, amsmath}
\usepackage{rotating}  
\usepackage{booktabs, makecell, multirow, tabularx, threeparttable}
\renewcommand\theadfont{\small\bfseries}
\renewcommand\theadgape{} 
\usepackage{colortbl, color} %I preffer that instead of xcolor because xcolor give me errors with beamer

\usepackage{caption}
\captionsetup{belowskip=-5pt}
\captionsetup[table]{justification=raggedright,singlelinecheck=off}

\usepackage{siunitx}
\begin{document}

\sisetup{table-align-uncertainty, separate-uncertainty=true}
\begin{tabularx}{\linewidth}{l | X S[table-format=4.1(3)] S[table-format=3.2(5)]}
    \Xhline{1pt}
    & \thead[l]{Results} 
        & {\thead{Method 1}} & {\thead{Method 2}}           \\
    \Xhline{0.7pt}
    &   & \multicolumn{2}{c}{First section}             \\ 
    \Xcline{3-4}{0.6pt}
\multirow{3}{*}{\rothead{Description 1}}
    & Very long name & 11,5(5)    & 444,34(7190) \\
    & Very long name & 109,2(753) & 2,80(66436)  \\
    & Very long name & 9438(8)    & 256,0(981)   \\
    & Very long name & 11,5(5)    & 444,34(7190) \\
    & Very long name & 109,2(753) & 2,80(66436)  \\
    & Very long name & 9438(8)    & 256,0(981)   \\
    \end{tabularx}
\end{document}

Answer 2

just answering your comment under leandriis answer, you can simply rotate the text directly there is no need for a multirow, also as I commented previously in chat I would never use tabularx for a table of data like this, tabularx is all about tables of text and line breaking in columns.

\documentclass{article}
\usepackage{float, enumitem, amsmath}
\usepackage{rotating}  
\usepackage{booktabs, makecell, multirow, tabularx, threeparttable}
\renewcommand\theadfont{\small\bfseries}
\renewcommand\theadgape{} 
\usepackage{colortbl, color} %I preffer that instead of xcolor because xcolor give me errors with beamer

\usepackage{caption}
\captionsetup{belowskip=-5pt}
\captionsetup[table]{justification=raggedright,singlelinecheck=off}

\usepackage{siunitx}
\begin{document}

\sisetup{table-align-uncertainty, separate-uncertainty=true}
\centering
\begin{tabular}{l | l S[table-format=4.1(3)] S[table-format=3.2(5)]}
    \Xhline{1pt}
    & \thead[l]{Results} 
        & {\thead{Method 1}} & {\thead{Method 2}}           \\
    \Xhline{0.7pt}
\smash{\rotatebox[origin=r]{90}{\bfseries Description 1}}
    &   & \multicolumn{2}{c}{First section}             \\ 
    \Xcline{3-4}{0.6pt}
    & Very long name & 11,5(5)    & 444,34(7190) \\
    & Very long name & 109,2(753) & 2,80(66436)  \\
    & Very long name & 9438(8)    & 256,0(981)   \\
    & Very long name & 11,5(5)    & 444,34(7190) \\
    & Very long name & 109,2(753) & 2,80(66436)  \\
    & Very long name & 9438(8)    & 256,0(981)   \\
    \end{tabular}
\end{document}