Résumé :
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[BDSP. Notice produite par INIST-CNRS I7R0xlqF. Diffusion soumise à autorisation]. We assessed whether the previously observed relationship between socioeconomic status (SES) and short-term mortality (pre-hospital mortality and 28-day case-fatality) after a first acute myocardial infarction (AMI) in persons<75 years, are also observed in the elderly (i.e.>75 years), and whether these relationships vary by sex. A nationwide register based cohort study was conducted. Between January 1st 1998 and December 31st 2007,76,351 first AMI patients were identified, of whom 60,498 (79.2%) were hospitalized. Logistic regression analyses were performed to measure SES differences in pre-hospital mortality after a first AMI and 28-day case-fatality after a first AMI hospitalization. All analyses were stratified by sex and age group (<55,55-64,65-74,75-84,>85), and adjusted for age, ethnic origin, marital status, and degree of urbanization. There was an inverse relation between SES and pre-hospital mortality in both sexes. There was also an inverse relation between SES and 28-day case-fatality after hospitalization, but only in men. Compared to elderly men with the highest SES, elderly men with the lowest SES had a higher pre-hospital mortality in both 75-84 year-olds (OR=1.26 ; 95% CI 1.09-1.47) and>=85 year-olds (OR=1.26 ; 1.00-1.58), and a higher 28-day case-fatality in both 75-84 year-olds (OR=1.26 ; 1.06-1.50) and>=85 year-olds (OR=1.36 ; 0.99-1.85). Compared to elderly women with the highest SES, elderly women with the lowest SES had a higher pre-hospital mortality in>=85 year-olds (OR=1.20 ; 0.99-1.46). To conclude, in men there are SES inequalities in both pre-hospital mortality and case-fatality after a first AMI, in women these SES inequalities are only shown in pre-hospital mortality. The inequalities persist in the elderly (>75 years of age). Clinicians and policymakers need to be more vigilant on the population with a low SES background, including the elderly.
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