A total of 165 EDs across the UK were monitored, including Craigavon Area, The Ulster, Royal Victoria and Antrim Area hospitals in Northern Ireland.
The research study headline is one in five people across the UK are cared for in escalation or corridor areas, in NI that figure is one in three.
The study also found that between 10-25% of EDs have no available resuscitation cubicle.
The biggest problem was found to be patient flow throughout the system – being able to discharge patients home when their hospital care is complete in order to admit others.
The RCEM said the figures confirm that corridor care is “endemic” in the UK and that these figures reveal the scale of the problem which ED staff have been describing for years.
UK College President Dr Ian Higginson said tackling the problem required investment.
“That doesn’t mean more money but instead how we choose to spend the money on keeping people out of hospital and what is spent on the number of hospital beds,” Dr Higginson said.
“We are calling on all the devolved nations to commit to eradicating corridor care” he said.