3
\documentclass[landscape]{scrartcl}
\usepackage{booktabs,array,enumitem,ragged2e}

\newcommand{\tablistcommand}{%
  \leavevmode\par\vspace{-\baselineskip}%
}

\newlist{tabitemize}{itemize}{1}
\setlist[tabitemize]{%
  leftmargin = *               ,
  label      = \textbullet     ,
  nosep                        ,
  before     = \tablistcommand ,
  after      = \tablistcommand
}

\begin{document}
\thispagestyle{empty}
\begin{table}
  \centering
  \caption{Wide Itemized Mixed Table}
  \label{tab:wide-item-tbl}
  \begin{tabular}{@{}l*{4}{>{\RaggedRight}p{2in}}@{}}
    \toprule
    \textbf{BSL} & \textbf{Agents} & \textbf{Practices}
    & \textbf{Primary barriers} & \textbf{Secondary barriers} \\
    \midrule
    1 & Not known to consistently cause diseases in healthy adults
      & standard microbiological practices
      & \begin{tabitemize}
        \item no primary barriers required,
        \item  PPE
        \end{tabitemize}
      & bench and sink required \tabularnewline
    2 & \begin{tabitemize}
        \item Agents associated with human diseases
        \item Routes of transmission include per-cutaneous injury,
          ingestion, mucous membrane exposure
        \end{tabitemize}
      & BSL-1 practice plus:
        \begin{tabitemize}[before=]
        \item limited access
        \item Biohazard warning signs
        \item ``Sharps'' precautions
        \item Biosafety manual defining any needed waste
          decontamination or medical surveillance polices
        \end{tabitemize}
      & Primary barriers:
        \begin{tabitemize}[before=]
        \item BSCs or other physical containment devices used for all
          manipulations of agents that cause splashes or aerosols of
          infectious materials
        \item PPE: Laboratory coats, gloves, face and eye protection,
          as needed
        \end{tabitemize}
      & BSL-1 plus:
        \begin{tabitemize}[before=]
        \item Autoclave available
        \end{tabitemize}\tabularnewline
    \bottomrule
  \end{tabular}
\end{table}
\end{document}
0
1

It does not appear centered because it is too wide for the page and overflows the right margin. Try setting different page dimensions e.g. using the geometry package. Also, you can visualise the margins e.g. by the showframe option. To achieve both add

\usepackage[showframe,left=2cm,right=2cm]{geometry}

to the preamble.

3

Try to use tabularx with width \linewidth and column types >{\RaggedRight}X}. With this your table will fit text width. To see page layout, you can help yourself with \uasepackage{showframe} or design layout with geometry package, for example \usepackage[margin=1in,showframe]{geometry}.

With this measures you will obtain something like this:

enter image description here

Beginning part of your code considering aforementioned is:

\documentclass[landscape]{scrartcl}
\usepackage{array,booktabs,tabularx}
\usepackage{enumitem,ragged2e}
\usepackage{showframe}

\newcommand{\tablistcommand}{%
  \leavevmode\par\vspace{-\baselineskip}%
}

\newlist{tabitemize}{itemize}{1}
\setlist[tabitemize]{%
  leftmargin = *               ,
  label      = \textbullet     ,
  nosep                        ,
  before     = \tablistcommand ,
  after      = \tablistcommand
}

\begin{document}
\thispagestyle{empty}
\begin{table}
  \caption{Wide Itemized Mixed Table}
  \label{tab:wide-item-tbl}
  \begin{tabularx}{\linewidth}{@{}l*{4}{>{\RaggedRight}X}@{}}
...

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