Data are collected from individual local health boards in Wales by NHS Wales Informatics Service (NWIS) and are subject to validation checks centrally prior to publication.
Mae’r data’n cael ei gasglu gan fyrddau iechyd lleol unigol yng Nghymru gan Wasanaeth Gwybodeg GIG Cymru (NWIS), ac yn amodol ar wiriadau dilysu canolog cyn ei gyhoeddi.