The data does not go through any formal validation processes and therefore is not published as Accredited Official Statistics (Office for Statistics Regulation (OSR)).
Nid yw'r data yn destun unrhyw brosesau dilysu ffurfiol ac felly nid yw'n cael ei gyhoeddi fel Ystadegau Swyddogol Achrededig (Swyddfa Rheoleiddio Ystadegau (OSR)).