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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.

From: The association between socioeconomic position, use of revascularization procedures and five-year survival after recovery from acute myocardial infarction

  Cumulative income*  
  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):         
   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         
   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
  1. * By adding the values of the quartile categories of income in 1975 and 1990 for each patient, we created a cumulative income variable ranging from 2–8.
  2. † Coronary revascularization was defined as discharge with any operation code '3066', '3067','3105', '3127', '3158', '3080', '3092' 'FNA', 'FNB', 'FNC', 'FND', 'FNE', 'FNF' or 'FNG' within one month after the first acute myocardial infarction.