The proportion of working age adults with no qualifications was highest in Blaenau Gwent (15.5%) and Merthyr Tydfil (14.9%).
Roedd y gyfran uchaf o oedolion o oedran gweithio heb unrhyw gymwysterau ym Mlaenau Gwent (15.5%) a Merthyr Tudful (14.9%).