Table 6.

Age- and sex-adjusted hazard rate ratios (HRR) with 95% confidence intervals for mortality within five years after 28-days survival from first acute myocardial infarction (AMI) by cumulative income and the use of revascularization procedures within the first month after the AMI in all 30,366 men and 16,041 women aged 45 to 84 years hospitalized in Swedish acute care facilities from 1993 to 1996.

	No revascularization§		Revascularization§
	High income†‡ HRR (95% CI)*	Low income‡ HRR (95% CI)	High income‡ HRR (95% CI)	Low income‡ HRR (95% CI)
All ages
Age and sex adjusted	(cases n = 3,886) 1.00‡¶	(cases n = 9,722) 1.35 (1.29, 1.40)¶	(cases n = 78) 0.60 (0.48, 0.75)	(cases n = 85) 0.69 (0.56, 0.86)
45–64 years
Age and sex adjusted	(cases n = 638) 1.00‡	(cases n = 639) 1.75 (1.55, 1.96)¶	(cases n = 25) 0.73 (0.50, 1.10)	(cases n = 23) 1.39 (0.90, 2.10)
65 years or more
Age and sex adjusted	(cases n = 3,248) 1.00‡¶	(cases n = 9,083) 1.29 (1.23, 1.34)¶	(cases n = 53) 0.57 (0.43, 0.74)	(cases n = 62) 0.58 (0.45, 0.75)

* HRR, Hazard rate ratio; CI, confidence interval.

† Reference category

‡ 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. This measure was divided into high and low income at the median, i.e., the value of 5.

§Coronary revascularization was defined as discharge with any operation code of '3066', '3067','3105', '3127', '3158', '3080', '3092','FNA', 'FNB', 'FNC', 'FND', 'FNE', 'FNF' or 'FNG' within one month after the first myocardial infarction.

¶Statistcically significant (p < 0.05) compared to those with high income who had revascularization.