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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: Circ Cardiovasc Qual Outcomes. 2010 Oct 19;3(6):590–598. doi: 10.1161/CIRCOUTCOMES.110.957878

Table 1.

Characteristics of Patients with Acute Myocardial Infarction (AMI) according to Extent of Delay in Seeking Medical Care

Characteristic < 2 hours (n=2,762) ≥ 2 hours (n=3,267) P-value < 6 hours (n=4791) ≥ 6 hours (n=1,238) P-value
Age (years, mean) 66.2 68.7 0.004 67.4 68.2 0.15
Age (years, %)
 <65 43.5 36.2 <0.001 40.3 36.4 0.002
 65–74 25.7 26.2 25.7 26.9
 ≥75 30.8 37.6 23.0 36.6
Female (%) 36.2 40.8 <0.001 38.4 39.7 0.43
White (%) 94.6 94.8 0.82 94.5 95.4 0.26
Marital Status (%)
 Single 10.9 9.7 0.001 10.1 10.7 0.71
 Married 63.3 61.1 62.5 60.3
 Divorced 7.1 6.4 6.6 6.9
 Widowed 18.7 22.7 20.6 21.9
Medical history (%)
 Atrial fibrillation 9.4 9.3 0.85 9.3 9.6 0.76
 Diabetes mellitus 24.9 30.1 <0.001 27.2 29.8 0.07
 Hypertension 58.4 61.6 0.012 60.6 58.4 0.17
 Heart failure 15.0 16.9 0.047 16.0 16.2 0.90
 Stroke 8.7 9.2 0.55 8.9 9.1 0.84
 PCI* 34.9 34.7 0.94 36.6 25.5 0.06
 CABG 6.4 5.4 0.12 6.0 5.2 0.25
AMI characteristics (%)
 Initial 66.4 67.1 0.52 65.9 70.1 0.005
 Q-wave 42.8 39.2 0.006 40.3 42.8 0.13
 Anterior 30.3 31.8 0.23 30.7 32.9 0.15
 STEMI 52.6 41.7 <0.001 48.4 40.5 0.001
Acute symptoms (%)
 Chest pain 39.5 35.0 <0.001 38.1 33.2 0.002
 Shortness of breath 28.5 24.6 0.001 27.3 22.9 0.002
 Nausea 18.4 16.9 0.13 17.9 16.6 0.27
 Diaphoresis 25.5 19.3 <0.001 23.6 15.9 <0.001
 Fatigue 5.3 5.5 0.80 5.2 6.1 0.21
Weekday hospitalization (%) 70.6 71.5 0.19 71.2 72.4 0.40
Time of day hospitalization (%)
 12am-5:59 am 21.6 18.6 <0.001 22.1 12.0 <0.001
 6-11:59 am 30.6 32.2 29.8 37.9
 12 pm-5:59 pm 25.2 28.7 25.8 31.9
 6 pm-11:59 pm 22.7 20.4 22.3 18.2
DNR order (%) 14.4 15.8 0.20 15.1 15.1 0.97
Clinical presentations, median
 Heart rate, beats/min 80 82 <0.001 80 83 0.001
 Systolic BP, mmHg 142 145 0.018 144 145 0.36
 Diastolic BP, mmHg 80 80 0.89 80 80 0.55
 BMI (kg/m2) 27.1 27.0 0.31 27.1 26.8 0.59
Laboratory findings, median
 Cholesterol (mg/dl) 198 201 0.14 199 203 0.08
 LDL (mg/dl) 109 112 0.18 109 116 0.034
 Triglyceride (mg/dl) 121 123 0.97 120 130 0.34
 Glucose (mg/dl) 145 147 0.27 147 142 0.019
 Creatinine (mg/dl) 1.1 1.1 0.56 1.1 1.1 0.99
*

Data on history of PCI were recorded beginning in 2003 and available for 546 patients.

Data were recorded beginning in 1997 and available for 2,771 patients.

Data were recorded beginning in 1991 and available for 4,384 patients.

Data were recorded beginning in 1995 and available for 2,931 patients.