There are also specific quality considerations for Census 2021 information collected on ethnic group, disabled people and sexual orientation and gender identity (ONS).
Ceir hefyd ystyriaethau ansawdd penodol ar gyfer gwybodaeth Cyfrifiad 2021 a gasglwyd ynghylch grŵp ethnig, pobl anabl a chyfeiriadedd rhywiol a hunaniaeth rhywedd (SYG)