Changing inequalities in life-expectancy by income in Finland 1997-2020

BACKGROUND: Previous studies show that in recent decades the changes in mortality disparities between income groups in Finland have been driven by alcohol- and smoking-related causes of death. The gap between the extreme income quintiles narrowed in 2008-14 particularly due to the declining alcohol-related mortality. We analysed the most recent changes in mortality disparities and the causes of deaths behind them. METHODS: We used register based individual level total population data for ages 30-95+ and yearly follow-up for mortality in 1996-2020 including information on disposable household income quintile in the previous year. Preston method was used for assessing the impact of smoking on mortality. We calculated trends in life expectancy (LE) at age 30 for three-year periods in 1997-2020 and then conducted an Arriaga cause of death decomposition of the gap between highest and lowest quintiles and changes in LE for each quintile from 2015-17 to 2018-20. RESULTS: We observed an increasing gap in LE by income due to stagnating LE in the lowest income quintile from 2015 onward among both men and women. Among men the stagnation was observed even after eliminating smoking- and alcohol-related mortality and among women the LE slightly increased after accounting for smoking and alcohol but the gap to the highest quintile increased clearly. Decomposing the change in LE from 2015-17 to 2018-2020 by causes of death showed no specific causes of death behind the stagnation and the widening gap. Among both men and women mortality due to circulatory diseases showed a substantial decline in the lowest quintile whereas in all other causes mortality increased or declined only slightly. CONCLUSIONS: Inequalities in LE by income are widening again in Finland due to stagnation in the lowest income quintile. Contrary to the prior decades the increasing disparities are not attributable to smoking and alcohol-related deaths but occur in the majority of causes of death. KEY MESSAGES: • After nearly a decade of narrowing mortality inequalities we observed an increasing gap in life expectancy by income mainly due to stagnation in the lowest income quintile. • Contrary to the prior decades the increasing disparities and stagnation of the lowest income quintile are not explained by smoking and alcohol-related deaths but occur in majority of causes of death.