Remove border on left side of table when using multirow

Question

I am creating a table using the tabular environment. The first column of the data section begins with the \multirow command. I would like to remove the border on the left side of the first column, and remove the thicker vertical line on the right of the first column over rows 2-6. I have looked at this answer, but I could not figure out how to translate the solution to the multirow context. I have also consulted a multirow help file but came up empty. I do not want to use the booktabs package because the journal where I will submit the article does not want authors to use extra packages. Here is the code for the table.

\begin{table}[h!]
\caption{Statistics for the 1Hz bedload flux time series}\vspace{1ex}
\centering
\scalebox{0.75}{
    \begin{tabular}{c c c c c c}
        & & \multicolumn{2}{c}{\large{\textbf{Steady-state}}} & \multicolumn{2}{c}{\large{\textbf{Transient}}} \\
        \cline{3-6}
        & & t1910min & t4070min & t2150min & t4310min \\
        \hline 
        \multicolumn{2}{c}{Total Time Series Duration (seconds)} & 14,396 & 14,245 & 4,582 & 4,529 \\
        \hline
        \multirow{7}{*}{Total Particle Count} &
        \multicolumn{1}{ |c| }{4 mm} & 21,631 & 28,803 & 80,049 & 97,680 \\ 
        \multicolumn{1}{ |c|  }{}                     &
        \multicolumn{1}{ |c| }{5.6 mm} & 11,423 & 18,043 & 38,782 & 47,241 \\ 
        \multicolumn{1}{ |c|  }{}                        &
        \multicolumn{1}{ |c| }{8 mm} & 5,262 & 9,370 & 17,662 & 21,673  \\ 
        \multicolumn{1}{ |c|  }{}                        &
        \multicolumn{1}{ |c| }{11.3 mm} & 3,303 & 5,710 & 9,630 & 11,626  \\ 
        \multicolumn{1}{ |c|  }{}                        &
        \multicolumn{1}{ |c| }{16 mm} & 935 & 1,719 & 2,695 & 3,087  \\ 
        \multicolumn{1}{ |c|  }{}                        &
        \multicolumn{1}{ |c| }{22.6 mm} & 92 & 278 & 410 & 568 \\
        \multicolumn{1}{ |c|  }{}                        &
        \multicolumn{1}{ c| }{\textbf{Total}} & \textbf{42,646} & \textbf{63,923} & \textbf{149,228} & \textbf{181,875} \\   
        \hline
        \label{Table1}
    \end{tabular}
    }
    \end{table}

Here is the output of the minimal working example, using the \multirow package:

Thanks for your help in advance.

Answer 1

this answer not solve directly your problem, it rather avoid it with removing all vertical lines in table:

(red lines indicate text border)

since you not provide any information about your document, in mwe (minimal working example) is considered standard article document class. in preamble are loaded packages and defined commands, which enable to design showed table.

\documentclass{article}
\usepackage{booktabs, makecell, multirow, tabularx}
\renewcommand\theadgape{}
\usepackage{siunitx}
\usepackage{etoolbox}% <-- new
\newcommand{\B}{\bfseries}
\robustify\B

%---------------- show page layout. don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%

\begin{document}
    \begin{table}[htb]
    \renewcommand\theadfont{\large\bfseries}
    \sisetup{detect-weight,
             mode=text,
             table-format=3.3,
             output-decimal-marker={,}}
\caption{Statistics for the 1Hz bedload flux time series}\vspace{1ex}
\label{Table1}
    \centering
\begin{tabularx}{\linewidth}{@{} X r SSSS @{}}
    &   & \multicolumn{2}{c}{\thead{Steady-state}}
            & \multicolumn{2}{c}{\thead{Transient}} \\
    \cmidrule(r){3-4}
    \cmidrule(l){5-6}
    &   & {t1910min} & {t4070min} & {t2150min} & {t4310min} \\
    \midrule
\multicolumn{2}{r}{TTSD (seconds):}
                    & 14,396 & 14,245 & 4,582 & 4,529 \\
    \midrule
\multirow{7}{=}{Total Particle Count}
    & \SI{4.0{mm}   &  21,631 &  28,803 &  80,049 &  97,680    \\
    & \SI{5.6}{mm}  &  11,423 &  18,043 &  38,782 &  47,241    \\
    & \SI{8.0}{mm}  &   5,262 &   9,370 &  17,662 &  21,673    \\
    & \SI{11.3}{mm} &   3,303 &   5,710 &   9,630 &  11,626    \\
    & \SI{16.0}{mm} & 935     &   1,719 &   2,695 &   3,087    \\
    & \SI{22.6}{mm} &  92     & 278     & 410     & 568        \\
    & \textbf{Total}
                    &\B 42,646 &\B 63,923 &\B 149,228 &\B 181,875 \\
    \bottomrule
\multicolumn{6}{l}{TTSD: Total Time Series Duration }
    \end{tabularx}
    \end{table}
    \end{document}

Answer 2

I am providing the following answer to follow-up on the excellent suggestions by @David and @Zarko. Here is a minimal working example (MWE) that addresses my questions, but slightly modifies the vertical lines within the table:

\documentclass[11pt]{article}
\usepackage{multirow}
\begin{document}
\begin{table}[h!]
\caption{Statistics for the 1Hz bedload flux time series}\vspace{1ex}
\centering
    \begin{tabular}{cccccc}
        & & \multicolumn{2}{c}{\large{\textbf{Steady-state}}} & \multicolumn{2}{c}{\large{\textbf{Transient}}} \\
        \cline{3-6}
        & & t1910min & t4070min & t2150min & t4310min \\
        \hline 
        \multicolumn{2}{r}{TTSD (sec.)} & 14,396 & 14,245 & 4,582 & 4,529 \\
        \hline
        \multicolumn{1}{ r| }{\multirow{7}{*}{Total Particle Count}}        &
        4 mm & 21,631 & 28,803 & 80,049 & 97,680 \\ 
        \multicolumn{1}{ r| }{}                     &
        5.6 m & 11,423 & 18,043 & 38,782 & 47,241 \\ 
        \multicolumn{1}{ r| }{}                        &
        8 mm & 5,262 & 9,370 & 17,662 & 21,673  \\ 
        \multicolumn{1}{ r| }{}                        &
        11.3 mm & 3,303 & 5,710 & 9,630 & 11,626  \\ 
        \multicolumn{1}{ r| }{}                        &
        16 mm & 935 & 1,719 & 2,695 & 3,087  \\ 
        \multicolumn{1}{ r| }{}                        &
        22.6 mm & 92 & 278 & 410 & 568 \\ \cline{2-6}
        \multicolumn{1}{ r| }{}                        &
        \textbf{Total} & \textbf{42,646} & \textbf{63,923} & \textbf{149,228} & \textbf{181,875} \\ 
        \hline
        \multicolumn{6}{l}{TTSD: Total Time Series Duration }
        \label{Table1}
    \end{tabular}
\end{table}
\end{document}

The MWE provides the resulting table:

I think the Table by @Zarko looks nicer, but my MWE preserves the vertical line between the \multirow text and the data classes. However, I lost the vertical line between the data classes and the data matrix. I appreciate the help.