Integrated care linked to higher projected life expectancy
Projected life expectancy at birth was 4.9 years higher among Kaiser Permanente Northern California members than the US average: 83.3 versus 78.4 years in 2023.
Cohort study, multicenter
Limit: Demographic differences between members and comparison populations could partly explain the life expectancy gap
Edited by Boris Djordjevic · AgingResearch.News
An observational study compared 3,944,173 Kaiser Permanente Northern California members, whose median age was 41, with US and state populations. The health system combined multiple evidence-based strategies to manage health across diseases.
After adjusting for age, sex and race, researchers found lower death rates for nine of the ten leading causes of death than in the overall US population. These included cancer, heart disease, stroke, unintentional injuries and respiratory disease. Death rates from Alzheimer’s disease were higher. Projected life expectancy exceeded all comparison populations. Life expectancy gaps between men and women and between Black and White people were smaller than nationwide gaps.
Why it matters
Preventable causes of death are central to the study’s question about longevity: how multiple existing care strategies relate to population health when used together.
Caveats
The observational comparisons cannot establish that the care strategies caused the differences. The study covered members of one Northern California health system, whose demographic makeup differed from the comparison populations.
The paper
Kaiser Permanente Northern California
Health Affairs Scholar, Jul 28, 2026, Open access
