Despite this, performance increased against the four-hour target, while the average time spent in emergency departments decreased in January compared to the previous month.
Er gwaethaf hyn, cynyddodd perfformiad yn erbyn y targed pedair awr, tra gwnaeth yr amser cyfartalog a dreulir mewn adrannau achosion brys ostwng ym mis Ionawr o gymharu â'r mis blaenorol.