Kinge JM, et al. - In this registry-based study, researchers characterized income-related differences in Norway's life expectancy and causes of death, and they compared these differences with estimates in the United States. The study sample consisted of all Norwegian residents (aged ≥ 40 years) from 2005 to 2015. According to findings, the difference in life expectancy was 8.4 years for women and 13.8 years for men between the richest and the poorest 1%. From 2005 to 2015, income-related differences in life expectancy increased, largely attributable to deaths from cardiovascular disease, cancers, chronic obstructive pulmonary disease, and dementia in older age groups and substance use deaths and suicides in younger age groups. Overall, the authors concluded that there were substantial and increasing gaps in life expectancy by income level in Norway between 2005 and 2015. Furthermore, the biggest differences in life expectancy between Norway and the United States were found to be in the lower to the middle part of the income distribution for individuals.