The rate remained the same in Cwm Taf Morgannwg and Cardiff and Vale, but decreased slightly in Powys and Welsh Ambulance Services NHS Trust.
Arhosodd y gyfradd yr un fath yng Nghwm Taf Morgannwg a Chaerdydd a’r Fro, ond gostyngodd ychydig ym Phowys ac Ymddiriedolaeth GIG Gwasanaethau Ambiwlans Cymru.