The main source of data used is the Wales National Workforce Reporting System (WNWRS) which has been supplied and validated by NHS Wales Shared Services Partnership.
Roedd yr adroddiad cyntaf yn cynnwys y set arferol o ddata a rennir ag aelodau ac roedd yr ail adroddiad yn darparu data ar y Cynllun Peilot Braenaru yng Ngogledd Cymru.