Table 2 Age-adjusted baseline characteristics of male patients aged 45 to 84 years that were hospitalized for first-time acute myocardial infarction in Swedish acute care facilities from 1993 to 1996 and who survived the first 28 days after admission (n = 30,366) according to cumulative income in the years 1975 and 1990.
| Â | Cumulative income* | Â | ||||||
|---|---|---|---|---|---|---|---|---|
| Â | 2 (n = 1,472) | 3 (n = 2,489) | 4 (n = 3,928) | 5 (n = 5,750) | 6 (n = 6,135) | 7 (n = 5,914) | 8 (n = 4,678) | p for trend |
Percentage of patients with previous hospitalizations (ICD codes): | Â | Â | Â | Â | Â | Â | Â | Â |
   Cancer (140–239) | 6.7 | 7.6 | 8.9 | 9.5 | 8.7 | 8.2 | 7.3 | 0.25 |
   Diseases of the respiratory system (460–519) | 10.7 | 10.2 | 10.0 | 9.5 | 8.7 | 7.6 | 7.4 | < 0.001 |
   Diabetes (250) | 9.2 | 9.1 | 8.0 | 6.5 | 5.9 | 5.0 | 4.4 | < 0.001 |
   Hypertension (401–405) | 6.4 | 7.1 | 7.4 | 7.0 | 6.8 | 6.7 | 6.7 | 0.38 |
   Angina pectoris/other ischemic heart disease (413–414) | 17.3 | 16.7 | 16.1 | 16.2 | 15.5 | 13.8 | 14.0 | < 0.001 |
   Cerebrovascular disease (430–438) | 8.1 | 7.6 | 8.0 | 7.4 | 7.2 | 6.6 | 6.4 | 0.001 |
University hospital, (%) | 11.1 | 11.5 | 11.9 | 12.4 | 13.8 | 16.9 | 20.1 | < 0.001 |
Hospital volume | Â | Â | Â | Â | Â | Â | Â | Â |
   0 – 500 | 15.8 | 13.4 | 12.3 | 12.1 | 11.4 | 11.3 | 8.7 | < 0.001 |
   500 – 1500 | 32.9 | 34.3 | 35.1 | 34.3 | 32.8 | 31.8 | 28.7 | < 0.001 |
   1500 – 2500 | 46.4 | 47.5 | 48.2 | 48.2 | 49.1 | 48.5 | 52.9 | < 0.001 |
   > 2500 | 6.3 | 5.7 | 6.0 | 6.5 | 7.9 | 9.9 | 11.4 | < 0.001 |
Revascularization†(%) | 1.3 | 1.8 | 2.3 | 2.8 | 2.9 | 2.9 | 3.4 | < 0.001 |