Some of the definitions below (for example, ‘couple households’) are specific to this analysis and may differ slightly from conventional census definitions.
Mae rhai o’r diffiniadau isod (er enghraifft, ‘cartrefi cwpwl’) yn benodol i’r dadansoddiad hwn a gallent fod ychydig yn wahanol i ddiffiniadau confensiynol y cyfrifiad.