For positive cases, the time taken to reach them measures the time between the case being referred to the contact tracing system and them being successfully contacted.
Ar gyfer achosion positif, mae'r amser a gymerir i'w cyrraedd yn mesur yr amser rhwng atgyfeirio'r achos i'r system olrhain cysylltiadau, a phan y llwyddir i gysylltu â hwy.