More information on the designation of these statistics can be found in the correspondence between the Welsh Government and the Office for Statistical Regulation.
Mae rhagor o fanylion yn Atodiad B am y rhyngweithio rhwng yr addasiadau hyn a refeniw trethi Llywodraeth Cymru (yn benodol, amseriad rhagolygon a chysoni â chanlyniadau gwirioneddol).