The ethnic group categories, including ‘other’ categories for write-in responses, were arranged within five high-level ethnic group categories.
Cafodd y categorïau o grwpiau ethnig, gan gynnwys y categorïau 'eraill' lle y gellir ychwanegu ymateb, eu trefnu o fewn pum categori o grwpiau ethnig lefel uchel.