Correlates of Delayed Initial Contact to Emergency Services among Patients with Suspected ST-Elevation Myocardial Infarction

Table 4

Multivariate, stepwise logistic regression of predictors of first EMS contact within 120 minutes (n = 273).

Independent variables	B	SE	Wald’s χ^2	df		OR	95% CI
Distance (reference <10 miles)	0.87	0.31	7.71	1	0.005	2.39	(1.30–4.38)
Marital status: unmarried (reference: married)	0.80	0.31	6.81	1	0.009	2.22	(1.21–4.09)
Self-medicated	2.20	0.64	11.87	1	0.001	9.02	(2.57–31.64)
Disability	1.48	0.45	10.95	1	0.001	4.38	(1.82–10.61)
Hemodynamic instability	-0.92	0.43	4.48	1	0.03	0.40	(0.17–0.93)

Final model statistics: χ² (5) = 40.02, , Cox and Snell R² = 0.13, and Nagelkerke R² = 0.20; EMS = emergency medical services.