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Roland Sturm a RAND, 1700 Main Street, Santa Monica, CA 90401, USA, b RAND, 1200 South Hayes Street,
Arlington, VA 22202, USA
Correspondence to: R Sturm sturm{at}rand.org
Objectives:
To analyse the relation between
geographical inequalities in income and the prevalence of common
chronic medical conditions and mental health disorders, and to compare
it with the relation between family income and these health problems.
What is already known on this topic
What this study adds
No such association is seen between income inequality and
health
Design:
Nationally representative household
telephone survey conducted in 1997-8.
Setting:
60 metropolitan areas or economic areas
of the United States.
Participants:
9585 adults who participated in the
community tracking study.
Main outcome measures:
Self report of 17 common
chronic medical conditions; current depressive disorder or anxiety
disorder assessed by clinical screeners.
Results:
A strong continuous association was seen between health and education or family income. No relation was found
between income inequality and the prevalence of chronic medical
problems or depressive disorders and anxiety disorders, either across
the whole population or among poorer people. Only self reported overall
health, the measure used in previous studies, was significantly
correlated with inequality at the population level, but this
correlation disappeared after adjustment for individual characteristics.
Conclusions:
This study provides no evidence for
the hypothesis that income inequality is a major risk factor for common
disorders of physical or mental health.
Several studies have found a relation between income inequality and
self reported health or mortality
There is a strong social gradient in health, as measured by the
prevalence of chronic medical conditions and specific mental health
disorders, by income or education