Getting rid of empty boxes in LaTeX table

Question

I am pretty new to LaTeX and i'm struggling with multicolumn/multirow tables. I have a table that has two empty boxes on the inside of it. I want to remove those boxes without changing the layout of the table in anyway. I know it's a really simple question, but for some reason i can't managed to find a solution :(
Here is the code i have for the table
begin{table}[h!]
centering
caption{A Confusion Matrix for the J48 Baseline}
begin{tabular}{|c|c|c|c|c|} 
hline
multicolumn{5}{|c|}{Confusion Matrix}
hline
&multicolumn{4}{|c|}{Predicted}
hline
&Category& 0-1 & 2-10 & 11-200   [0.5ex] 
hline
multirow{4}{*}{Truth Data}
&0-1&17964 & 2437& 1210 
&2-10&5093 & 11334 & 5209 
&11-200 &1519& 3302 & 16638 [1ex] 
hline
end{tabular}
label{table:3}
end{table}

Michel Janssens · Accepted Answer

Is this what you want? It does not look that nice.
documentclass[10pt]{report}
usepackage{multirow}
usepackage{multicol}
usepackage{hhline}

begin{document}
begin{table}[h!]
    centering
    caption{A Confusion Matrix for the J48 Baseline}
    begin{tabular}{|c|c|c|c|c|} 
        hline
        multicolumn{5}{|c|}{Confusion Matrix}
        hline
        multicolumn{1}{c}{}&multicolumn{4}{|c|}{Predicted}
        hhline{~|----|}
        multicolumn{1}{c|}{}&Category& 0-1 & 2-10 & 11-200   [0.5ex] 
        hline
        multirow{4}{*}{Truth Data}
        &0-1&17964 & 2437& 1210 
        &2-10&5093 & 11334 & 5209 
        &11-200 &1519& 3302 & 16638 [1ex] 
        hline
    end{tabular}
    label{table:3}
end{table}
end{document}

This is better but not that great either
documentclass[10pt]{report}
usepackage{multirow}
usepackage{multicol}
usepackage{hhline}

begin{document}
begin{table}[h!]
    centering
    caption{A Confusion Matrix for the J48 Baseline}
    begin{tabular}{|c|c|c|c|c|} 
        hhline{~|----|}
        multicolumn{1}{c}{}&multicolumn{4}{|c|}{Confusion Matrix}
        hhline{~|----|}
        multicolumn{1}{c}{}&multicolumn{4}{|c|}{Predicted}
        hhline{~|----|}
        multicolumn{1}{c|}{}&Category& 0-1 & 2-10 & 11-200   [0.5ex] 
        hline
        multirow{4}{*}{Truth Data}
        &0-1&17964 & 2437& 1210 
        &2-10&5093 & 11334 & 5209 
        &11-200 &1519& 3302 & 16638 [1ex] 
        hline
    end{tabular}
    label{table:3}
end{table}
end{document}

egreg · Answer

I'd make some small, but important, adjustments in order to reduce ugliness.
documentclass{IEEEtran}
usepackage{showframe} % just for the picture

usepackage{multirow}
usepackage{makecell}

begin{document}

begin{table}[!htp]
centering

caption{A Confusion Matrix for the J48 Baseline}
label{table:3}

setcellgapes{3pt}
makegapedcells

begin{tabular}{|c|c|c|c|c|} 
cline{2-5}
multicolumn{1}{c|}{} & multicolumn{4}{c|}{Confusion Matrix}
cline{2-5}
multicolumn{1}{c|}{} &multicolumn{4}{c|}{Predicted}
cline{2-5}
multicolumn{1}{c|}{} & smash{Category} & 0--1 & 2--10 & 11--200  
hline
multirow{3.5}{*}{Truth Data}
&  0--1   & 17964 &  2437 &  1210  
&  2--10  &  5093 & 11334 &  5209 
& 11--200 &  1519 &  3302 & 16638  
hline
end{tabular}
end{table}

begin{table}[!htp]
centering

caption{A Confusion Matrix for the J48 Baseline}
label{foo}

setcellgapes{3pt}
makegapedcells

begin{tabular}{c|cccc|} 
multicolumn{1}{c}{} & multicolumn{4}{c}{Confusion Matrix}
cline{2-5}
multicolumn{1}{c}{} &multicolumn{4}{c}{Predicted}
%cline{2-5}
multicolumn{1}{c}{} & smash{Category} & 0--1 & 2--10 & multicolumn{1}{c}{11--200}  
cline{2-5}
multirow{3.5}{*}{makebox[0pt][r]{Truth Data}}
&  0--1   & 17964 &  2437 &  1210  
&  2--10  &  5093 & 11334 &  5209 
& 11--200 &  1519 &  3302 & 16638  
cline{2-5}
end{tabular}
end{table}

end{document}

I also added a different version that you may find more appealing.
The black corner in the second picture shows the left margin. Remove usepackage{showframe} for the production version.

Getting rid of empty boxes in LaTeX table

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