Paradox Between Immigrant Advantages in Morbidity and Mortality: Dynamic Patterns and Tentative Explanations

Area of Science:

• Gerontology
• Public Health
• Sociology of Health and Illness

Background:

• Immigrants often exhibit a morbidity-mortality paradox: higher rates of chronic conditions and disabilities but lower overall mortality compared to natives, particularly at older ages.
• Understanding how this paradox evolves across the lifespan and for diverse immigrant subgroups is crucial for public health interventions.

Purpose of the Study:

• To comprehensively investigate the age-related dynamics of the immigrant morbidity-mortality paradox.
• To examine how ethnoracial, sex, and educational factors influence these patterns.
• To identify the underlying mechanisms contributing to the observed paradox.

Main Methods:

• Utilized longitudinal data from the IPUMS National Health Interview Survey (2002-2018) linked with mortality data through 2019.
• Analyzed a large cohort (n=405,270) to assess chronic conditions, disabilities, and mortality across different age groups and immigrant characteristics.
• Employed decomposition analysis to dissect the factors contributing to changes in disability and mortality gaps.

Main Results:

• Immigrants' advantages in chronic conditions and disabilities diminish with age, while their mortality advantages increase.
• These patterns persist across diverse ethnoracial, sex, and educational immigrant groups.
• Narrowing disability gaps are linked to increased mental illness and diabetes, while mortality advantages strengthen due to lower death rates from chronic diseases.

Conclusions:

• Health-based selection may postpone disease onset and enhance resilience to mortality consequences among immigrants.
• The morbidity-mortality paradox among immigrants is a dynamic phenomenon that changes significantly with age.
• Findings highlight the need for targeted health policies considering age and immigrant status.