Cardiff and Vale currently has the lowest number waiting longer than 12 hours in emergency departments at 925, while Betsi Cadwaladr has the highest at 3,151.
Ar hyn o bryd, Caerdydd a’r Fro sydd â’r nifer isaf sy’n aros mwy na 12 awr mewn adrannau brys (925), a Betsi Cadwaladr sydd â’r nifer uchaf (3,151).