Individual-level data on women is held by various services such as the police, courts, and local justice boards which can be aggregated to create a national picture.
Mae data ar fenywod ar lefel unigol yn cael ei gadw gan wasanaethau amrywiol fel yr heddlu, llysoedd, a byrddau cyfiawnder lleol y gellir eu cydgrynhoi i greu darlun cenedlaethol.