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American Focus > Blog > Health and Wellness > Study reveals stark differences in life expectancy across US states over the past century
Health and Wellness

Study reveals stark differences in life expectancy across US states over the past century

Last updated: May 5, 2025 6:29 pm
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Study reveals stark differences in life expectancy across US states over the past century
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A groundbreaking study conducted by researchers at the Yale School of Public Health (YSPH) has shed light on the significant disparities in life expectancy across different states in the United States over the past hundred years. Published in JAMA Network Open, the study provides valuable insights into how various factors such as public health policies, social conditions, and environmental influences have played a crucial role in shaping the longevity of Americans based on their geographical location.

By analyzing over 179 million deaths between 1969 and 2020, the research team was able to track life expectancy trends by birth cohort, providing a more accurate measure of the life experiences of different generations. The findings of the study revealed a stark contrast between states, with some experiencing substantial gains in life expectancy while others, particularly in the Southern region, saw minimal to no improvement over the course of a century.

Lead author Dr. Theodore R. Holford highlighted the staggering differences in life expectancy trends, particularly for females born in Southern states. While states like New York and California witnessed a remarkable increase of more than 20 years in life expectancy from 1900 to 2000, Southern states like Mississippi, Alabama, and Kentucky saw marginal improvements, especially among women. These disparities were attributed to systemic factors such as socioeconomic disadvantages, limited access to healthcare, and weaker public health initiatives.

States in the Northeast and West, as well as the District of Columbia, recorded the greatest gains in life expectancy over the years. The study noted that D.C., which had the lowest life expectancy for the 1900 birth cohort, achieved a significant improvement of 30 years for females and 38 years for males by 2000, reflecting changes in urban policies and demographics. On the other hand, states with fewer improvements in life expectancy were associated with higher rates of poverty and other social determinants of health.

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The multidisciplinary research team, comprising biostatisticians, epidemiologists, and health policy experts from Yale, the University of Michigan, and the University of British Columbia, employed an age-period-cohort model to disentangle the effects of aging, historical events, and generational influences on mortality. This approach helped in understanding how early-life exposures, such as access to healthcare and environmental factors, influenced health outcomes later in life.

The study also highlighted the disparities in mortality rates across different states, with some regions showing slower mortality increases after the age of 35, indicating healthier aging, while others experienced faster mortality escalations. The researchers emphasized that these patterns are a result of cumulative effects of various factors, including smoking rates, healthcare access, environmental exposures, and public health investments.

Moving forward, the researchers hope that their findings will inform policymakers and public health officials on the importance of addressing health inequities across different states. By viewing health through a generational lens, they believe that early interventions and investments in public health can have a positive ripple effect on future generations. Ultimately, the study underscores the critical need for conscious policy changes to bridge the gap in life expectancy disparities and ensure a healthier future for all Americans.

TAGGED:CenturyDifferencesexpectancyLifeRevealsStarkstatesStudy
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