The person response rate is the number of usual residents for whom individual details were provided on a returned questionnaire, divided by the estimated usual resident population.
Cyfradd ymateb unigolion yw nifer y preswylwyr arferol y cafodd manylion unigol eu darparu ar eu cyfer ar holiadur a ddychwelwyd, wedi'i rannu ag amcangyfrif o'r boblogaeth breswyl arferol.