Compression of Morbidity and Mortality: New Perspectives.

Area of Science:

• Gerontology
• Public Health
• Biostatistics

Background:

• Compression of morbidity signifies reduced lifetime chronic disability, influenced by morbidity incidence, case-fatality, and recovery rates.
• Chronic disability encompasses limitations in daily living and cognitive functions, relevant for long-term care insurance.
• Morbidity improvement can compress morbidity if prevalence rate reductions outweigh increased disability duration from mortality gains.

Purpose of the Study:

• To review and relate concepts of morbidity compression and mortality compression.
• To analyze the application of these concepts to historical mortality and recent morbidity trends in the United States.
• To discuss implications for future health and disability trends.

Main Methods:

• Review of established concepts: compression of morbidity and compression of mortality.
• Empirical analysis of mortality data over the past century.
• Empirical analysis of morbidity/disability data from 1984-2004.

Main Results:

• Significant slowdown observed in the rate of mortality compression over the last 50 years.
• Unexpectedly substantial morbidity compression occurred between 1984 and 2004.
• External evidence suggests continued morbidity compression beyond 2004.

Conclusions:

• Mortality improvement does not automatically lead to mortality compression.
• Morbidity compression has been more significant than anticipated, indicating progress in reducing chronic disability.
• Future US health trends may see continued reductions in disability, though mortality compression has decelerated.