A New England Journal of Medicine study found clear longevity differences between Americans and Europeans across wealth levels. The researchers also found that while the wealthiest Americans live longer than the poorest, the wealth-mortality gap in the US is far more pronounced than in Europe.

Americans at all wealth levels are more likely to die sooner than their European counterparts, with even the richest US citizens living shorter lives than northern and western Europeans. That is the key finding of our new study, published in the New England Journal of Medicine.

The study also found that, while the wealthiest Americans live longer than the poorest, the wealth-mortality gap in the US is far more pronounced than in Europe.

The study was conducted by a team of health policy researchers who study health systems and how their performance compares across countries.

The analysed survey data from 73,838 adults ages 50 to 85 across the US and 16 European countries over a 12-year period and compared how long people across the wealth spectrum lived during the course of our study. The 16 European countries are grouped into European regions: Northern and Western, Southern and Eastern Europe.

The research revealed that people in the wealthiest 25 per cent of the study population across the US and Europe were 40 per cent less likely to die during the study period than the poorest quarter of people.

The wealthiest 25 per cent of people in Northern and Western Europe had mortality rates that were about 35 per cent lower than participants in the wealthiest quartile in the US for those from Southern Europe, during the study period, this value ranged from 24 per cent to 33 per cent.

For those from Eastern Europe, the value ranged from 1 per cent to 7 per cent. The poorest individuals in the US appear to have the worst survival, including when compared with the poorest quarter of people in each European region.

Wealth inequality has been rising for decades, but more so in the US than in Europe due to a widening gap between the wealth of the richest and the poorest.

At the same time, despite spending significantly more on healthcare than other wealthy nations, overall, the US consistently demonstrates worse health outcomes such as higher infant mortality rates and avoidable mortality.

The study also reveals a wider wealth-mortality gap in the US when compared with Europe. In other words, personal wealth does buy more years of life in the US than in Europe.

These findings suggest that personal wealth alone is not enough to compensate for other factors that tend to affect how long people live, such as health behaviours like smoking or heavy drinking, education or social support.

At its core, our research suggests that health outcomes are shaped by much more than just healthcare systems. It is likely that economic and social policies – from education and employment to housing and food security – play a crucial role in determining how long people live, including across the wealth distribution.

European countries have found ways to reduce health disparities without dramatically increasing health spending. By distributing health-promoting resources more equally across wealth groups, these nations may have created environments where longevity is less dependent on individual wealth.

While our study shows clear longevity differences between Americans and Europeans across wealth levels, more work still needs to be done to determine which specific aspects of European social systems — whether healthcare delivery, education access, retirement security or tax policies — most effectively protect health regardless of personal wealth.

Pinpointing exactly how these factors interact with wealth to influence health outcomes would allow researchers to identify which European policies could be most successfully adapted to improve longevity for all Americans.

Looking ahead, the researchers plan to identify which of those policy levers might be most effective in reducing mortality gaps.

• A Tell Media report / By Sara Machado and Irene N. Papanicolas / Originally published by The Conversation