R-code related question- balance tests

You can get close to this with {pander} or {kableExtra}, but @macjo16 is right—for full-fig publication quality you need to output to pdf and do a fair amount of LaTeX dark art, using xtable and perhaps shell scripting like

pandoc main.Rmd --to latex --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash-implicit_figures --output main.pdf --template /Users/rc/steamer/thematicR/packrat/lib/x87_64-apple-darwin13.4.0/3.2.1/rmarkdown/rmarkdown/templates/tufte_handout/resources/tufte-handout.tex --highlight-style pygments --latex-engine /Library/TeX/texbin/xelatex

or even lua filters to pandoc. It all depends on the data, the layout desired and facility with LaTeX.

See the FAQ: How to do a minimal reproducible example reprex for beginners. Data is key. It doesn't have to be all your data, or even your data at all. And, come to think of it, is your question presentation (which is what we've been discussing) or does it have to do with the calculations?