Does personality explain social inequalities in mortality? The French GAZEL cohort study

Hermann Nabi · Mika Kivimaki B · Michael Gideon Marmot · Jane E. Ferrie · Marie Zins · Pierre Ducimetière +2 more

63 citations0/0 files storedInternational Journal of Epidemiology

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Health disparities and outcomes Personality Traits and Psychology Public Health and Social Inequalities

Abstract

BACKGROUND: The 'indirect-selection' hypothesis proposes that some quality of the individual, a personality characteristic or intelligence, leads to both socioeconomic position (SEP) and health. We aim to quantify the contribution of personality measures to the associations between SEP and mortality. METHODS: Of the GAZEL cohort, 14 445 participants aged 39-54 years in 1993 and followed-up over 12.7 years, completed the Bortner-Type-A-scale, the Buss-Durkee-Hostility-Inventory and the Grossarth-Maticek and Eysenck-Personality-Stress-Inventory. Indicators of SEP, such as father's social class, education, occupational grade and income, were assessed at baseline. Relative indices of inequality in Cox regression models were used to estimate associations. RESULTS: In age-adjusted analyses, risk of death was inversely associated with SEP among men and women. Among men, the attenuation in this association depended on the measures of SEP and was 28-29% for 'neurotic-hostility', 13-22% for 'anti-social' and 13-16% for 'CHD-prone' personality. In women, the attenuation was evident only for type-A-behaviour, by 11%. After controlling simultaneously for all personality factors that predicted mortality, associations between SEP and mortality were attenuated in men: by 34% for education, 29% for occupational position and 28% for income; but were only attenuated by 11% for income in women. For cardiovascular mortality, the corresponding percentages of reduction were 42, 31 and 44% after adjustment for 'CHD-prone' personality in men. CONCLUSIONS: Personality measures explained some of the mortality gradients observed for measures of adult socioeconomic position in men, but had little explanatory power in women. Whether personality represents a predictor or an outcome of social circumstances needs further research.

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References

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