Your own source states...Newspaper ads for women sometimes did include NINA, but Irish women nevertheless dominated the market for domestics because they provided a reliable supply of an essential service.
Newspaper ads for men with NINA were exceedingly rare.
” Your own source states...Newspaper ads for women sometimes did include NINA, but Irish women nevertheless dominated the market for domestics because they provided a reliable supply of an essential service.”
For women it was mostly religious - Protestants not wanting to hire Catholic nannies.