The survey response rate was 47%; of all Welsh speakers identified in the National Survey for Wales, 47% of people had completed and returned the questionnaire.
Cyfradd ymateb yr arolwg oedd 47%; o’r holl siaradwyr Cymraeg a gafodd eu hadnabod yn Arolwg Cenedlaethol Cymru, roedd 47% o’r bobl wedi cwblhau a dychwelyd yr holiadur.