Demographics |
Median age (IQR) |
73 (69–78) |
72 (69–78) |
72 (69–78) |
73 (69–78) |
74 (70–78) |
74 (70–78) |
0.010 |
- |
Women |
44.7 |
36.9 |
42.2 |
46.7 |
49.6 |
46.7 |
0.088 |
0.020 |
White race |
92.3 |
94.6 |
95.0 |
91.2 |
88.4 |
89.2 |
0.002 |
<0.001 |
Smoker |
20.2 |
14.4 |
21.6 |
22.5 |
15.2 |
17.1 |
0.037 |
0.22 |
Cerebrovascular disease |
10.4 |
9 |
7.9 |
12.5 |
10.7 |
13.3 |
0.035 |
0.013 |
Prior coronary bypass |
8.9 |
7.2 |
7 |
9.2 |
12.5 |
11.7 |
0.046 |
0.005 |
Prior percutaneous coronary intervention |
12.2 |
20.7 |
10.3 |
13.2 |
9.8 |
14.2 |
0.013 |
0.99 |
Hypertension |
58.6 |
50.4 |
55 |
60.9 |
58.9 |
67.5 |
0.003 |
<0.001 |
Diabetes mellitus |
22.9 |
25.2 |
18.9 |
21.9 |
26.8 |
33.8 |
<0.001 |
<0.001 |
Prior myocardial infarction |
19.2 |
17.1 |
15.4 |
21.9 |
21.4 |
23.3 |
0.010 |
0.003 |
Congestive heart failure |
6.7 |
4.5 |
5.9 |
6.7 |
6.7 |
10.4 |
0.15 |
0.019 |
Chronic obstructive pulmonary disease |
15.9 |
12.6 |
15.6 |
16.4 |
16.1 |
17.5 |
0.83 |
0.32 |
Presentation |
Symptoms <6 hours |
73.2 |
79.3 |
81.3 |
73.3 |
67.9 |
50.0 |
<0.001 |
<0.001 |
No chest pain |
3.7 |
1.8 |
2.2 |
4.0 |
3.1 |
9.2 |
<0.001 |
<0.001 |
Median sytolic blood pressure (IQR) |
136 (115–159) |
132 (113–150) |
135 (114–160) |
136 (113–156) |
140 (120–162) |
140 (120–160) |
0.045 |
- |
Median heart rate (IQR) |
76 (63–89) |
76 (63–89) |
75 (60–88) |
75 (62–89) |
79 (66–93) |
80 (67–92) |
<0.001 |
- |
Shock |
7.1 |
9.0 |
6.1 |
7.7 |
5.8 |
9.6 |
0.30 |
0.31 |
Cardiac arrest |
5.3 |
3.6 |
4.5 |
6.7 |
4.9 |
5.4 |
0.41 |
0.38 |
Electrocadiographic findings |
Anterior myocardial infarction |
56.5 |
55.9 |
54.9 |
59.6 |
54 |
56.7 |
0.45 |
0.71 |
Left bundle branch block on admission |
4.8 |
1.8 |
2.1 |
4.2 |
9.5 |
11.7 |
<0.001 |
<0.001 |
Median sum ST elevation |
7.5 (5.0–12.0) |
9.0 (5.0–13.0) |
8.0 (5.5–13.0) |
7.0 (4.5–12.0) |
6.5 (4.0–11.0) |
6.5 (4.0–10.0) |
<0.001 |
- |
Q wave myocardial infarction |
88.6 |
89.2 |
90.8 |
88.2 |
87.5 |
83.8 |
0.049 |
0.005 |
Hospital characteristics |
Median myocardial infarction volume (IQR) |
202 (136–340) |
192 (148–340) |
203 (142–325) |
214 (136–346) |
188 (129–364) |
202 (132–326) |
0.81 |
- |
On-site surgical back-up |
89.2 |
91.9 |
88.3 |
89.6 |
89.7 |
89.6 |
0.78 |
0.78 |
Ownership |
|
|
|
|
|
|
0.40 |
- |
Public |
10.3 |
9.1 |
11.2 |
8.9 |
13.1 |
8.8 |
|
|
Not-for-profit |
77.8 |
76.4 |
77.9 |
79.4 |
72.1 |
79.5 |
|
|
For-profit |
11.9 |
14.6 |
10.8 |
11.7 |
14.9 |
11.7 |
|
|
Teaching status |
|
|
|
|
|
|
0.18 |
- |
Non-teaching |
47.1 |
52.2 |
45.1 |
46.7 |
51.3 |
47.9 |
|
|
Teaching |
35.9 |
31.5 |
39.4 |
35.9 |
29.9 |
32.1 |
|
|
Council of Teaching Hospitals |
17 |
16.2 |
15.4 |
17.4 |
18.8 |
20 |
|
|
Rural hospital |
5.5 |
6.4 |
5.5 |
6.7 |
4.5 |
3.4 |
0.36 |
0.20 |