Attendances waiting four hours or longer in emergency departments, December 2011 onwards, file type: ODS, file size: 156 KB
Nifer y cleifion a arhosodd bedair awr neu fwy mewn adrannau achosion brys, rhwng mis Rhagfyr 2011 ymlaen, math o ffeil: ODS, maint ffeil: 162 KB