Maximum emergency department overcrowding is correlated with occurrence of unexpected cardiac arrest

Table 3 Correlation between ED occupancy rate and cardiac arrest occurrence

	Critical zone ED occupancy rate		Urgent zone ED occupancy rate		Total ED occupancy rate
	ρ	P	ρ	P	ρ	P
IHCA time point
At ED presentation	0.86	0.01	0.35	0.33	1.0	< 0.01
At time of cardiac arrest	0.89	< 0.01	0.77	< 0.01	0.96	< 0.01
Maximum ED occupancy rate^a	1.0	< 0.01	0.94	< 0.01	1.0	< 0.01
Average ED occupancy rate^a	0.96	< 0.01	0.44	0.20	1.0	< 0.01

Abbreviations: ED emergency department, IHCA in-hospital cardiac arrest
^aMaximum and average ED occupancy rate was measured during ED stay before arrest

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