In 2021, 2,900 of these tests (16%) were categorised as either ‘positive or refused’, compared to 3,600 (14%) in 2020.
Yn 2021, roedd 2,900 o’r profion hyn (16%) naill ai’n bositif, neu wedi cael eu gwrthod, o'i gymharu â 3,600 (14%) yn 2020.