dies ist leider kein Minimalbeispiel, aber ich hoffe abgespeckt genug.
\documentclass[english,12pt,oneside, a4paper]{article}
\usepackage{graphicx} % need for figures
\usepackage{verbatim} % useful for program listings
\usepackage{color} % use if color is used in text
\usepackage{subfigure} % use for side-by-side figures
\usepackage{hyperref} % use for hypertext links, including those to external documents and URLs
\usepackage{pstricks-add}
\usepackage[english]{babel}
\usepackage{amsmath,amsthm,amssymb,amsfonts,amscd,amsbsy,amsxtra}
\usepackage{stmaryrd}
\usepackage{tikz}
\usepackage{paralist}
\usepackage{changepage}
\usepackage{tabularx}
\usepackage{pst-all}
\usepackage{natbib}
\setlength{\baselineskip}{16.0pt} % 16 pt usual spacing between lines
\begin{document}
\begin{table}[h]
\begin{adjustwidth}{-0.5cm}{}
\caption{Comparing the two models}
\label{my-label}
\begin{tabular}{|>{\centering}p{3cm}|>{\centering}p{3cm}|>{\centering}p{3cm}|>{\centering}p{3cm}|} \\ \hline
\rule{0pt}{15pt} 2 & 3 & 4 & 5 \\ \hline
\rule{0pt}{15pt} A & B & 0 & C \\ \hline
\rule{0pt}{15pt} D & E & F & G \\ \hline
\end{tabular}
\end{adjustwidth}
\end{table}
\end{document}
Habt ihr eine Ahnung weshalb?
