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Place of living affects longevity of elderly people, finds study

Written By : Hina Zahid |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2021-09-09T09:00:59+05:30  |  Updated On 9 Sept 2021 9:01 AM IST
Place of living affects longevity of elderly people, finds study
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USA: A recent study has pointed out that some locations enhance longevity more than others, potentially for multiple reasons. In simpler words, where you live, not just how you live can make a big difference for your longevity.

That's the finding of an innovative study co-authored by an MIT economist, which examines senior citizens across the U.S.

The results show that when a 65-year-old moves from a metro area in the 10th percentile, in terms of how much those areas enhance longevity, to a metro area the 90th percentile, it increases that person's life expectancy by 1.1 years. That is a notable boost, given that mean life expectancy for 65-year-olds in the U.S. is 83.3 years.

"There's a substantively important causal effect of where you live as an elderly adult on mortality and life expectancy across the United States," says Amy Finkelstein, a professor in MIT's Department of Economics and co-author of a newly published paper detailing the findings.

Researchers have long observed significant regional variation in life expectancy in the U.S., and often attributed it to "health capital" -- tendencies toward obesity, smoking, and related behavioral factors in the regional populations. But by analyzing the impact of moving, the current study can isolate and quantify the effect that the location itself has on residents.

As such, the research delivers important new information about large-scale drivers of U.S. health outcomes -- and raises the question of what it is about different places that affects the elderly's life expectancy. One clear possibility is the nature of available medical care. Other possible drivers of longevity include climate, pollution, crime, traffic safety, and more.

That's the finding of an innovative study co-authored by an MIT economist, which examines senior citizens across the U.S. and concludes that some locations enhance longevity more than others, potentially for multiple reasons.

The results show that when a 65-year-old moves from a metro area in the 10th percentile, in terms of how much those areas enhance longevity, to a metro area the 90th percentile, it increases that person's life expectancy by 1.1 years. That is a notable boost, given that mean life expectancy for 65-year-olds in the U.S. is 83.3 years.

"There's a substantively important causal effect of where you live as an elderly adult on mortality and life expectancy across the United States," says Amy Finkelstein, a professor in MIT's Department of Economics and co-author of a newly published paper detailing the findings.

Researchers have long observed significant regional variation in life expectancy in the U.S., and often attributed it to "health capital" -- tendencies toward obesity, smoking, and related behavioral factors in the regional populations. But by analyzing the impact of moving, the current study can isolate and quantify the effect that the location itself has on residents.

As such, the research delivers important new information about large-scale drivers of U.S. health outcomes -- and raises the question of what it is about different places that affects the elderly's life expectancy. One clear possibility is the nature of available medical care. Other possible drivers of longevity include climate, pollution, crime, traffic safety, and more.

Still, even assessing people by 27 measures does not completely describe their health, so Finkelstein, Gentzkow, and Williams also estimated what fraction of people's health conditions they had not observed -- essentially by calibrating the observed health of seniors against health capital levels in places they were moving from. They then consider how observed health varies across individuals from the same location moving to different destinations and, assuming that differences in unobserved health -- such as physical mobility -- vary in the same way as observed differences in health, they adjust their estimates accordingly.

All told, the study found that many urban areas on the East and West Coasts -- including New York City, San Francisco, and Miami -- have positive effects on longevity for seniors moving there. Some Midwestern metro areas, including Chicago, also score well.

By contrast, a large swath of the deep South has negative effects on longevity for seniors moving there, including much of Alabama, Arkansas, Louisiana, and northern Florida. Much of the Southwest, including parts of Texas, Oklahoma, New Mexico, and Arizona, fares similarly poorly.

The scholars also estimate that health capital accounts for about 70 percent of the difference in longevity across areas of the U.S., and that location effects account for about 15 percent of the variation.

"Yes, health capital is important, but yes, place effects also matter," Finkelstein says.

The Charlotte Effect: What makes a difference?

Indeed, the significance of place effects on life expectancy is also evident in another pattern the study found. Some locations -- such as Charlotte, North Carolina -- have a positive effect on longevity but still have low overall life expectancy, while other places -- such as Santa Fe New Mexico -- have high overall life expectancy, but a below-average effect on the longevity of seniors who move there.

Again, the life expectancy of an area's population is not the same thing as that location's effect on longevity. In places where, say, smoking is highly prevalent, population-wide longevity might be subpar, but other factors might make it a place where people of average health will live longer. The question is why.

"Our [hard] evidence is about the role of place," Finkelstein says, while noting that the next logical step in this vein of research is to look for the specific factors at work. "We know something about Charlotte, North Carolina, makes a difference, but we don't yet know what."

With that in mind, Finkelstein, Gentzkow, and Williams, along with other colleagues, are working on a pair of new studies about health care practices to see what impact place-based differences may have; one study focuses on doctors, and the other looks at the prescription opioid epidemic.

In the background of this research is a high-profile academic and policy discussion about the impact of health care utilization. One perspective, associated with the Dartmouth Atlas of Health Care project, suggests that the large regional differences in health care use it has documented have little impact on mortality. But the current study, by quantifying the variable impact of place, suggest there may be, in turn, a bigger differential impact in health care utilization yet to be identified.

For her part, Finkelstein says she would welcome further studies digging into health care use or any other factor that might explain why different places have different effects on life expectancy; the key is uncovering more hard evidence, wherever it leads.

"Differences in health care across places are large and potentially important," Finkelstein says. "But there are also differences in pollution, weather, [and] other aspects. … What we need to do now is get inside the black box of 'the place' and figure out what it is about them that matters for longevity."

Reference:

Finkelstein, Amy, Matthew Gentzkow, and Heidi Williams. 2021. "Place-Based Drivers of Mortality: Evidence from Migration." American Economic Review, 111 (8): 2697-2735.

DOI: 10.1257/aer.20190825


longevityAmerican Economic Reviewsenior citizens
Source : American Economic Review
Hina Zahid
Hina Zahid

    Hina Zahid Joined Medical Dialogue in 2017 with a passion to work as a Reporter. She coordinates with various national and international journals and association and covers all the stories related to Medical guidelines, Medical Journals, rare medical surgeries as well as all the updates in the medical field. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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