A Swiss paradox? Higher income inequality of municipalities is associated with lower mortality in Switzerland.

Clough-Gorr, Kerri M; Egger, Matthias; Spoerri, Adrian (2015). A Swiss paradox? Higher income inequality of municipalities is associated with lower mortality in Switzerland. European journal of epidemiology, 30(8), pp. 627-636. Springer 10.1007/s10654-015-9987-7

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It has long been surmised that income inequality within a society negatively affects public health. However, more recent studies suggest there is no association, especially when analyzing small areas. This study aimed to evaluate the effect of income inequality on mortality in Switzerland using the Gini index on municipality level. The study population included all individuals >30 years at the 2000 Swiss census (N = 4,689,545) living in 2,740 municipalities with 35.5 million person-years of follow-up and 456,211 deaths over follow-up. Cox proportional hazard regression models were adjusted for age, gender, marital status, nationality, urbanization, and language region. Results were reported as hazard ratios (HR) with 95 % confidence intervals. The mean Gini index across all municipalities was 0.377 (standard deviation 0.062, range 0.202-0.785). Larger cities, high-income municipalities and tourist areas had higher Gini indices. Higher income inequality was consistently associated with lower mortality risk, except for death from external causes. Adjusting for sex, marital status, nationality, urbanization and language region only slightly attenuated effects. In fully adjusted models, hazards of all-cause mortality by increasing Gini index quintile were HR = 0.99 (0.98-1.00), HR = 0.98 (0.97-0.99), HR = 0.95 (0.94-0.96), HR = 0.91 (0.90-0.92) compared to the lowest quintile. The relationship of income inequality with mortality in Switzerland is contradictory to what has been found in other developed high-income countries. Our results challenge current beliefs about the effect of income inequality on mortality on small area level. Further investigation is required to expose the underlying relationship between income inequality and population health.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Social and Preventive Medicine

UniBE Contributor:

Clough, Kerri; Egger, Matthias and Spörri, Adrian

Subjects:

600 Technology > 610 Medicine & health
300 Social sciences, sociology & anthropology > 360 Social problems & social services

ISSN:

0393-2990

Publisher:

Springer

Language:

English

Submitter:

Doris Kopp Heim

Date Deposited:

17 Apr 2015 11:15

Last Modified:

24 Sep 2015 01:30

Publisher DOI:

10.1007/s10654-015-9987-7

PubMed ID:

25600296

BORIS DOI:

10.7892/boris.62776

URI:

https://boris.unibe.ch/id/eprint/62776

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