Table 4

 Rate ratios of mortality attributable to acute myocardial infarction by income, education, and occupational position (Swedish study population 1990–95, 10368 deaths, controlled for sex) as estimated by means of Cox regression

Model 1Model 2 (mutually adjusted)
Rate ratios95% CIRate ratios95% CI
Income (quintiles)
Income: highest 20% (reference category)11
Income: higher 20%1.421.32 to 1.541.211.11 to 1.31
Income: mean 20%1.721.60 to 1.861.381.27 to 1.51
Income: lower 20%2.031.87 to 2.211.631.49 to 1.79
Income: lowest 20%2.442.26 to 2.631.891.74 to 2.06
Not classified for income4.624.32 to 4.953.192.94 to 3.46
Occupational position
Intermediates/executives (reference category)11
Non-manuals1.441.34 to 1.551.060.98 to 1.15
Skilled manuals1.621.52 to 1.721.081.00 to 1.17
Unskilled/semi skilled1.971.87 to 2.091.221.13 to 1.31
Not classified for occupational position 3.693.46 to 3.931.491.37 to 1.62
Education
University degree (reference category)11
Long secondary1.341.22 to 1.471.161.06 to 1.28
Short secondary1.711.57 to 1.861.281.16 to 1.41
Basic2.242.09 to 2.401.451.33 to 1.57
Not classified for education2.562.29 to 2.851.321.18 to 1.49