Without adjusting by attendances, the highest and lowest number of patients waiting longer than 12 hours were also in Betsi Cadwaladr (3,063) and Cardiff and Vale (916).
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).