When comparing NHS organisations, the rate ranged from 9.7% in the Welsh Ambulance Services NHS Trust to 1.4% in Health Education and Improvement Wales.
Mae amcangyfrif consensws SAGE ar gyfer y rhif atgynhyrchu yng Nghymru rhwng 1.0 a 1.4, tra bod amcangyfrif Iechyd Cyhoeddus Cymru (PHW) rhwng 1.4 ac 1.6.