38,904 patients spent longer than 12 hours in Accident and Emergency departments, 5,062 more than the previous year and the highest number on record.
Er hynny, treuliodd 841,617 o gleifion lai na’r amser targed mewn adran Damweiniau ac Achosion Brys, sef 19,355 yn fwy nag yn 2016-17 a’r mwyaf ers 2013-14.