In two other health boards the agreed data collection method has been implemented but has resulted in both reporting a very low number of vacancies across some staff groups.
Mewn dau fwrdd iechyd arall cafodd y dull casglu data y cytunwyd arno ei weithredu ond mae wedi arwain at y ddau yn adrodd nifer isel iawn o swyddi gwag ar draws rhai grwpiau staff.