Alineación a la izquierda en una tabla de descripción de variables.

Alineación a la izquierda en una tabla de descripción de variables.

No puedo entender por qué en el siguiente código (posiblemente necesito pulir un poco el preámbulo, lo sé), no puedo alinear las "Variables" a la izquierda. Probé diferentes soluciones pero aún así permanece centrado.

Otro problema (menor y menos importante) es que intenté cambiar el orden de las columnas, poniendo la descripción al final. Sin embargo, siempre recibo un mensaje de error. ¿Alguna idea?

\documentclass[11pt]{article}
\usepackage{rotating}

\usepackage{longtable}
\usepackage[labelfont=bf, labelsep=newline, justification=centering, textfont=it]{caption}
\usepackage{adjustbox}
\usepackage{graphicx}
\usepackage{booktabs, makecell, siunitx}
\usepackage{eqparbox}
\pagenumbering{gobble}
\usepackage{booktabs}
\usepackage[referable,para]{threeparttablex}
\usepackage[a4paper,margin=1.5cm]{geometry}
\usepackage{multirow}
\usepackage{pdflscape}
\usepackage{stackengine}
\usepackage{interval}
\usepackage{amsmath,ragged2e} % <-- new
\usepackage{interval,pbox}

\usepackage{booktabs,tabularx}

\sisetup{group-separator={,}, table-format=1.3, table-space-text-post=***, 
table-number-alignment =center}
\newcommand*{\MyIndent}
{\hspace*{1.5cm}}
\usepackage{dcolumn}
\newcolumntype{d}[1]{D..{#1}}
\newcommand\mc[1]{\multicolumn{1}{c}{#1}} % handy shortcut macro

\newcommand\mytab[1]{%
   \smash[b]{\begin{tabular}[c]{@{}c@{}}#1\end{tabular}}}
\hyphenation{bur-kina}

\begin{document}

\begin{table}
\renewcommand{\arraystretch}{1.5} 

\caption{Descriptions of variables\label{A1}}
\begin{tabularx}{\textwidth}{@{}lXSS@{}}
\toprule
\multicolumn{1}{l}{Variables}&\mc{Description}&\mc{Mean}&\mc{SD}\\
\midrule
Health&Test of a really long description which should itself span many rows, in fact occupying much space, hopefully, causing it to span a couple of normal rows. Test of a really long description which should itself span many rows, in fact occupying much space, hopefully, causing it to span a couple of normal rows&\mc{0.8049}&\mc{0.3928}\\
Age&Test of a really long description which should itself span many rows, in fact occupying much space, hopefully, causing it to span a couple of normal rows&\mc{49.16}&\mc{15.82}\\
\bottomrule
\end{tabularx}
\end{table}
\end{document}

Respuesta1

¿Algo como esto?

\documentclass[11pt]{article}
\usepackage{rotating}

\usepackage{longtable}
\usepackage[labelfont=bf, labelsep=newline, justification=centering, textfont=it]{caption}
\usepackage{adjustbox}
\usepackage{graphicx}
\usepackage{booktabs, makecell, siunitx}
\usepackage{eqparbox}
\pagenumbering{gobble}
\usepackage{booktabs}
\usepackage[referable,para]{threeparttablex}
\usepackage[a4paper,margin=1.5cm]{geometry}
\usepackage{multirow}
\usepackage{pdflscape}
\usepackage{stackengine}
\usepackage{interval}
\usepackage{amsmath,ragged2e} % <-- new
\usepackage{interval,pbox}

\usepackage{booktabs,tabularx}

\sisetup{group-separator={,}, table-format=1.3, table-space-text-post=***, 
table-number-alignment =center}
\newcommand*{\MyIndent}
{\hspace*{1.5cm}}
\usepackage{dcolumn}
\newcolumntype{d}[1]{D..{#1}}
\newcommand\mc[1]{\multicolumn{1}{c}{#1}} % handy shortcut macro

\newcommand\mytab[1]{%
   \smash[b]{\begin{tabular}[c]{@{}c@{}}#1\end{tabular}}}
\hyphenation{bur-kina}

\begin{document}

\begin{table}
\renewcommand{\arraystretch}{1.5} 

\caption{Descriptions of variables\label{A1}}
\begin{tabularx}{\textwidth}{@{}lXSS@{}}
\toprule
\multicolumn{1}{@{}l}{Variables}&\mc{Description}&\mc{Mean}&\mc{SD}\\ % @{} here
\midrule
Health&Test of a really long description which should itself span many rows, in fact occupying much space, hopefully, causing it to span a couple of normal rows. Test of a really long description which should itself span many rows, in fact occupying much space, hopefully, causing it to span a couple of normal rows&\mc{0.8049}&\mc{0.3928}\\
Age&Test of a really long description which should itself span many rows, in fact occupying much space, hopefully, causing it to span a couple of normal rows&\mc{49.16}&\mc{15.82}\\
\bottomrule
\end{tabularx}
\end{table}
\end{document}

ingrese la descripción de la imagen aquí

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