Table 5.
Age-adjusted hazard rate ratios (HRR) and 95 percent confidence intervals (95% CI) of mortality within five years after 28-days survival from first acute myocardial infarction in relation to income in 1975 and in 1990 as well as cumulative income 1975 and 1990 in 30,366 men and 16,041 women aged 45 to 84 years that were hospitalized in Swedish acute care facilities from 1993 to 1996.
| Men | Women | |
| HRR (95% CI)† | HRR (95% CI)† | |
| Model A | ||
| Independent income effects | ||
| Income in 1990 | ||
| (4) high | 1.00‡ | 1.00‡ |
| (3) medium to high | 1.23 (1.14, 1.32) | 1.21 (1.06, 1.38) |
| (2) medium to low | 1.43 (1.33, 1.54) | 1.24 (1.09, 1.41) |
| (1) low | 1.63 (1.51, 1.77) | 1.44 (1.27, 1.63) |
| Income in 1975 | ||
| (4) high | 1.00‡ | 1.00‡ |
| (3) medium to high | 1.02 (0.96, 1.08) | 0.95 (0.83, 1.08) |
| (2) medium to low | 1.10 (1.03, 1.17) | 1.01 (0.91, 1.13) |
| (1) low | 1.22 (1.13, 1.33) | 1.07 (0.97, 1.18) |
| Model B | ||
| Cumulative income 1975 and 1990* | ||
| Sum 8 | 1.00‡ | 1.00‡ |
| Sum 7 | 1.18 (1.08, 1.29) | 1.97 (1.45, 2.68) |
| Sum 6 | 1.28 (1.17, 1.40) | 1.66 (1.23, 2.23) |
| Sum 5 | 1.49 (1.37, 1.63) | 1.81 (1.36, 2.41) |
| Sum 4 | 1.59 (1.46, 1.75) | 1.86 (1.40, 2.47) |
| Sum 3 | 1.75 (1.59, 1.93) | 2.00 (1.51, 2.65) |
| Sum 2 | 1.99 (1.79, 2.21) | 2.24 (1.69, 2.97) |
* Cumulative income is obtained by summing the values of the quartile categories of income in 1975 and in 1990. This variable has the minimum value of two if the patient belonged to the low income group (1) in both 1975 and 1990 (i.e., value = 1 + 1), and the maximum value of eight if the patient belonged to the high income group (i.e., value = 4 + 4).
† HRR, hazard rate ratio; CI, Confidence interval
‡ Reference category