There have been several improvements made to the antibody modelling which has resulted in some small changes to the antibody positivity estimates in recent weeks.
Dros y misoedd diwethaf mae nifer o newidiadau yn yr arfaeth o ran mesur perfformiad yng ngwasanaethau’r GIG sy’n effeithio ar yr ystadegau a gyhoeddir yn y datganiad hwn.