A team of Swedish scientists have used national registries of more than 3.4 million Swedes aged 40 to 80 to study the association between dog ownership and cardiovascular health. Their study shows that dog owners had a lower risk of death due to cardiovascular disease or to other causes during the 12-year follow-up. A total of more than 3.4 million individuals without any prior cardiovascular disease in 2001 were included in the researchers' study linking together seven different national data sources, including two dog ownership registers. The results were published for the first time on November 17, 2017 in Scientific Reports. The goal was to determine whether dog owners had a different risk of cardiovascular disease and death than non-dog owners. The open-access Scientific Reports article is titled “Dog Ownership and the Risk of Cardiovascular Disease and Death – A Nationwide Cohort Study.” "A very interesting finding in our study was that dog ownership was especially prominent as a protective factor in persons living alone, which is a group reported previously to be at higher risk of cardiovascular disease and death than those living in a multi-person household. Perhaps a dog may stand in as an important family member in the single households. The results showed that single dog owners had a 33% reduction in risk of death and 11% reduction in risk of myocardial infarction during follow-up compared to single non-owners. Another interesting finding was that owners of dogs from breed groups originally bred for hunting were most protected," says Mwenya Mubanga, lead junior author of the study and a PhD student at the Department of Medical Sciences and the Science for Life Laboratory, Uppsala University. In Sweden, every person carries a unique personal identity number. Every visit to a hospital is recorded in national databases, accessible to researchers after de-identification of data. Even dog ownership registration has been mandatory in Sweden since 2001. These scientists studied whether being registered as a dog-owner was associated with later diagnosis of cardiovascular disease or death from any cause.
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