Data for calls to the 111 service is administrative data, that is collected for monitoring the provision of the service and not entirely for the purpose of producing statistics.
Data gweinyddol yw’r data ar gyfer galwadau i’r gwasanaeth 111, a gesglir ar gyfer monitro darpariaeth y gwasanaeth ac nid yn gyfan gwbl at ddibenion cynhyrchu ystadegau.