. Author manuscript; available in PMC: 2009 Dec 15.

Published in final edited form as: Am J Cardiol. 2008 Oct 30;102(12):1589–1594. doi: 10.1016/j.amjcard.2008.07.056

Table 3.

Factors associated with prolonged pre-hospital delay (Worcester Heart Attack Study)

	Delay ≥ 2 Hours		Delay ≥ 6 Hours
Characteristic	Adjusted OR	95% CI	Adjusted OR	95% CI
Age (years)
55–64	1.19	1.01, 1.41	1.09	0.82, 1.46
65–74	1.26	1.07, 1.48	1.35	0.91, 1.98
≥75	1.56	1.32, 1.84	1.53	0.89, 2.61
Female	1.05	0.93, 1.17	0.96	0.82, 1.11
White Race	1.01	0.94, 1.08	0.97	0.89, 1.06
Marital Status
Single	0.98	0.82, 1.17	1.17	0.94, 1.45
Divorced	1.01	0.81, 1.25	1.15	0.88, 1.49
Widowed	1.04	0.89, 1.22	1.03	0.86, 1.25
Medical history
Angina pectoris	1.10	0.97, 1.25	0.94	0.81, 1.11
Diabetes mellitus	1.26	1.11, 1.42	1.19	1.02, 1.37
Hypertension	1.05	0.93, 1.18	0.91	0.79, 1.05
Heart failure	0.96	0.81, 1.13	1.05	0.86, 1.28
Stroke	0.90	0.74, 1.08	0.95	0.76, 1.21
AMI characteristics
Initial	0.84	0.74, 0.95	0.81	0.69, 0.93
Q-wave	1.11	0.99, 1.24	0.94	0.82, 1.09
Anterior	0.98	0.87, 1.11	0.96	0.82, 1.11
Chief symptom complaint
Chest pain	0.91	0.75, 1.10	0.78	0.62, 0.98
Shortness of breath	0.92	0.67, 1.25	0.98	0.68, 1.41
Weekend	0.95	0.84, 1.07	0.98	0.85, 1.13
Died during hospitalization	1.16	0.95, 1.41	0.94	0.73,1.19
Study year
1990/1991	1.17	0.97, 1.41	1.41	1.12, 1.78
1993/1995	1.18	0.98, 1.41	1.39	1.11, 1.74
1997/1999	1.10	0.85, 1.4	1.56	1.15, 2.10
2001/2003	0.93	0.73, 1.18	1.07	0.78, 1.45
2005	0.95	0.71, 1.26	1.25	0.88, 1.79

Reference groups are those < 55 years, males, nonwhite race, married, absence of selected medical conditions, previous AMI, non Q-wave AMI, inferior or posterior AMI, presenting with chief symptom complaint other than chest pain or dyspnea, hospitalization during the week, survived hospitalization, and study years 1986/1988.