documentclass[a4paper,12pt]{book}
usepackage{amsmath}
usepackage{bm}

pagestyle{plain}
usepackage{setspace}
raggedbottom

usepackage{mathtools}
usepackage{longtable}

usepackage{booktabs}
usepackage{multirow}
usepackage{array, booktabs, ragged2e}
usepackage{threeparttablex}


{renewcommand*{arraystretch}{1.5}
begin{spacing}{.85}

begin{ThreePartTable}
begin{TableNotes}
footnotesize
item [a] Data source: SLLFS 2014
item [b] Percentage values in the table are percentages of the number of women (xxxx) and men (xxxx) in the sample
end{TableNotes}


begin{longtable}{p{1ex}>{RaggedRight}p{1.95cm}*{3}{p{1.45cm}p{2cm}}}
caption{Characteristics of study sample by job type and gendertnote{a}}label{chap1:tab1}\toprule


endfirsthead
multicolumn{7}{p{4cm}} {Table 1 (emph{continued})}\ toprule
&           & multicolumn{2}{l}{Female} & multicolumn{2}{l}{Male} & \
cmidrule{3-4} cmidrule(lr){5-6} cmidrule{7-8}
&            & Informal & Formal & Total & Informal & Formal & Total \midrule
endhead
hlinemulticolumn{7}{r}{tablename thetable -- textit{Continued on next page}} \
endfoot
hline
insertTableNotes  % tell LaTeX where to insert the contents of "TableNotes"
endlastfoot

&           & multicolumn{2}{l}{Female} & multicolumn{2}{l}{Male} &\
cmidrule{3-4} cmidrule(lr){5-6} cmidrule{7-8}

&            & Informal & Formal & Total & Informal & Formal & Total \midrule
multicolumn{2}{l}{textit{Age}} & \

& 15-24 & 663 & 20.994 & 19 & 5.791 & 682 & 20.019\
& 25-34 & 1071 & 32.091 & 114 & 37.959 & 1185 & 32.383\
& 35-44 & 866 & 23.826 & 86 & 28.394 & 952 & 24.053\
& 45-54 & 530 & 15.416 & 58 & 18.217 & 588 & 15.555\
& 55-64 & 251 & 7.721 & 29 & 9.636 & 280 & 7.816\
bottomrule

end{longtable}
end{ThreePartTable}
end{spacing}
}