This research has been undertaken as part of Administrative Data Research (ADR) Wales planned programme of work 2022-2026 funded by the Economic Social Research Council.
Mae’r gwaith ymchwil hwn wedi’i wneud fel rhan o raglen waith gynlluniedig Ymchwil Data Gweinyddol (YDG) Cymru 2022–2026 a ariennir gan y Cyngor Ymchwil Economaidd a Chymdeithasol.