Additional analysis shows that of the 212 GP practitioners leaving the workforce between 2016 and 2017, just over half re-joined as a GP locum.
Mae dadansoddiad ychwanegol yn dangos bod ychydig dros hanner o'r 212 o feddygon teulu a adawodd y gweithlu rhwng 2016 a 2017 wedi ail-ymuno fel meddygon teulu locwm.