We are aware of an issue affecting the data received from Swansea Bay University Health Board covering the period from 16 February to 31 March.
Rydym yn ymwybodol o fater sy'n effeithio ar y data a dderbyniwyd gan Fwrdd Iechyd Prifysgol Bae Abertawe ar gyfer y cyfnod rhwng 16 Chwefror a 31 Mawrth.