More details about how the Office for National Statistics (ONS) has protected the confidentiality of individuals can be found in the quality and methodology information section.
Mae mwy o fanylion am sut mae’r Swyddfa Ystadegau Gwladol (SYG) wedi diogelu cyfrinachedd unigolion i’w gweld yn yr adran ar wybodaeth am ansawdd a methodoleg.