Table 3.

Factors associated with prolongation of eDAD

	eDAD > 89.1 min
	OR	95% CI	P value
Age ≤ 64 years	1.00	[Ref.]
65–74 years	1.25	0.80–1.97	0.33
≥ 75 years	2.01	1.29–3.12	< 0.01*
Women	0.70	0.45–1.09	0.12
Recurrent MI	0.96	0.54–1.69	0.89
No witness	1.64	1.14–2.35	0.01*
Onset in winter	0.82	0.57–1.18	0.29
Onset on weekends/holiday	1.03	0.69–1.53	0.89
Onset at night	1.68	1.16–2.44	< 0.01*
Killip class 3/4 on arrival	0.94	0.55–1.59	0.81
No EMS call	3.17	2.08–4.83	< 0.01*
Medical region and transport way
Urban (direct admission)	1.00	[Ref.]
Rural (direct admission)	0.98	0.65–1.50	0.94
Urban (inter-facility transfer)	3.16	1.40–7.11	< 0.01*
Rural (inter-facility transfer)	3.57	2.11–6.07	< 0.01*

Adjusted odds ratio (OR) and 95% confidence interval (CI) from logistic regression analysis indicating the likelihood of eDAD (estimated delay-in-arrival-at-the-door) > 89.1 min (median eDAD). OR > 1 indicates increased odds of prolongation of each time component. Respective reference categories = age ≤ 64 years, male gender, first occurrence of MI, presence of a witness, onset in summer, onset in the daytime, Killip class 1/2 on arrival, EMS call, and urban medical region (direct admission). CPC, cerebral performance category; MI, myocardial infarction; Daytime, 6:00 a.m–6:00 p.m; Nighttime, 6:00 p.m–6:00 a.m; urban medical regions, Sapporo, Kamikawa Chubu, and Minami Oshima medical regions; rural medical regions, regions outside the urban medical regions

* P < 0.05