Cardiff and Vale had the lowest percentage waiting longer than 12 hours in emergency departments at 7.9%, while Betsi Cadwaladr had the highest at 17.2%.
Caerdydd a’r Fro oedd â’r ganran isaf yn aros mwy na 12 awr mewn adrannau brys, sef 7.9%, a Betsi Cadwaladr oedd â’r gyfran uchaf, sef 17.2%.