Closing the life expectancy gap: An ecological study of the factors associated with smaller regional health inequalities in post-reunification Germany.

Regional health inequalities are rising globally. The case of German reunification offers a unique opportunity to explore how such inequalities can be reduced, or even eliminated: following reunification, a long-standing life expectancy gap between East and West Germany was closed for women and markedly reduced for men in less than 15 years. We used data from official national statistics covering the period 1994-2020 for 15 regions in East and West Germany. Using fixed-effects models with an interaction term for regions in the East, we investigated whether within-region changes in key hypothesised factors (social security expenditure, healthcare improvements, changes in alcohol consumption, and life satisfaction), have had differential impacts on life expectancy at birth and at 65 years. Our results show that increases in social security benefits in the East following reunification has been the most important factor for lowering inequalities between the two parts of Germany: for every 10% increase in social security benefits, life expectancy at birth increased by an additional 1.05 [0.68; 1.41] months for males and by 0.57 [0.18; 0.97] months for females in East relative to West Germany. We find the protective effect of social security benefits also for women at 65 years (additional 0.38 [0.06; 0.70] months) but not for men. Our findings suggest that increasing social security expenditure could be an effective policy tool for reducing health inequalities across regions with different levels of economic development. This provides additional support for the materialist hypothesis and the political economy theory of the root causes of health inequalities.