One of these projects involved linking the Shielded Patient List with administrative data to estimate the number of shielded households and the number of people living with a shielded person.
Roedd un o'r prosiectau hyn yn cynnwys cysylltu'r Rhestr Gwarchod Cleifon â data Gwasanaeth Demograffeg Cymru (WDS) i amcangyfrif nifer y bobl sy'n byw gyda pherson a warchodir.