Mark off another reason to marry: Finnish researchers find that being unmarried increases the risk of fatal and non-fatal heart attacks in both men and women, whatever their age.
In the large population-based study, researchers discovered being married and cohabiting are associated with “considerably better prognosis of acute cardiac events both before hospitalization and after reaching the hospital alive.”
The beneficial effect was especially pronounced in middle age.
The study, published today in the European Journal of Preventive Cardiology, was based on the FINAMI myocardial infarction register data from the years 1993 to 2002.
Scandinavian countries tend to maintain copious records on health care utilization, making them ideal sites for epidemiological research. In the current study, researchers were privy to heath information on people over the age of 35 living in four geographical regions of Finland.
All fatal and non-fatal cardiac events — known as “acute cardiac syndromes” or ACS — were included and cross-referred to the population database.
“Our aim,” said the authors, “was to study the differences in the morbidity and prognosis of incident acute coronary syndromes according to socio-demographic characteristics (marital status and household size).”
The register recorded 15,330 ACS events over the study period of 10 years, with just over half (7,703) resulting in death within 28 days. Events occurred almost equally among men and women.
However, the analysis also showed that the age-standardized incidences of these ACS events were approximately 58–66 percent higher among unmarried men and 60–65 percent higher in unmarried women, than among married men and women in all age groups.
The differences in 28-day mortality rate were even greater. These 28-day mortality rates were found to be 60–168 percent higher in unmarried men and 71–175 percent higher in unmarried women, than among married men and women.
For example, the 28-day ACS mortality rate in 65-74-year-old married men was 866 per 100,000 persons per year but 1,792 per 100,000 per year in unmarried men. This rate did not differ according to previous marital status.
Similarly, mortality rates among 65-74-year-old married women were 247 per 100,000 persons per year, but 493 per 100,000 when the woman was unmarried.
Statistically, the figures represented a 28-day “case fatality” rate of 26 percent in the 35-64-year-old married men, 42 percent in men who had previously been married, and 51 percent in never-married men. Among women, the corresponding figures were 20 percent, 32 percent, and 43 percent.
Consistent with this finding, the case fatality rate of 35-64-year-old single men and women was higher than that of those living with one or more people.
Researchers say this study was unique because it included information on genders across a wide age range.
Why should single living or being unmarried be associated with such a greater susceptibility to coronary events, and particularly fatal events? The authors suggest several possibilities:
Lead author Aino Lammintausta, M.D., of Turku University Hospital in Finland also said these differences in prognosis cannot be fully explained by differences in treatment-seeking time or access to effective therapy.
The sociodemographic differences reflected in the study’s results are a “considerable population health problem,” she said, warranting further research.
Source: European Society of Cardiology