Tremors were felt in the Greek capital of Athens and as far away as the southern island of Crete
"All of these factors are accordingly individually associated with a strongly elevated risk of dying from Covid-19," Drefahl added.
The study is based on data from the Swedish National Board of Health and Welfare on all registered deaths from Covid-19 in Sweden for adults aged 20 and older.
In a study, published in the journal Nature Communications, Drefahl explained that those born abroad generally have lower mortality than people born in Sweden.
The study shows that being a man, having a lower income and lower level of education also result in a strongly elevated risk of dying from Covid-19. As to these aspects, this also agrees with the patterns for mortality from other diseases.
The findings showed that men had more than twice as high a risk of dying from Covid-19 than women.
Unmarried men and women (including those never married, widows/widowers and the divorced) had a 1.5-2 times as high risk of dying from Covid-19 as those who were married.
According to the researchers, men generally have higher mortality at comparable ages, which is considered to be due to a combination of biology and lifestyle.
"The fact that people with little education or a low income have higher mortality may largely be due to lifestyle factors, including finances -- how much one can afford to prioritise one's health," said study author Gunnar Andersson
"Similarly, we can explain the elevated mortality from Covid-19 for these groups," Andersson added.
A number of earlier studies have also shown that single and unmarried people have higher mortality from various diseases, the research team noted.
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