Because more equal societies work better for everyone

Mental Health

In brief / Body
In Brief

People in more equal societies are far less likely to experience mental illness.

In detail
In More Detail
We first showed a relationship between mental illness and income inequality in eight developed countries with WHO data - the USA, France, Netherlands, Belgium, Spain, Germany, Italy, and Japan. Since then we've been able to add data for New Zealand and for some other countries whose surveys of mental illness, although not strictly comparable, use very similar methods - Australia, the UK and Canada. As the graph below shows, mental illness is much more common in more unequal countries. Among these countries, mental illness is also more common in the richer ones.

Until recently it was hard to compare levels of mental illness between different countries because nobody had collected strictly comparable data, but recently the World Health Organisation has established world mental health surveys that are starting to provide data. They show that different societies have very different levels of mental illness. In some countries only 5 or 10% of the adult population has suffered from any mental illness in the past year, but in the USA more than 25% have.

We first showed a relationship between mental illness and income inequality in eight developed countries with WHO data - the USA, France, Netherlands, Belgium, Spain, Germany, Italy, and Japan. Since then we've been able to add data for New Zealand and for some other countries whose surveys of mental illness, although not strictly comparable, use very similar methods - Australia, the UK and Canada. As the graph below shows, mental illness is much more common in more unequal countries. Among these countries, mental illness is also more common in the richer ones.

More Information
More Information

Pickett KE, James OW, Wilkinson RG. Income inequality and the prevalence of mental illness: a preliminary international analysis. Journal of Epidemiology and Community Health 2006;60(7):646-7.

Wilkinson RG, Pickett KE. The problems of relative deprivation: why some societies do better than others. Social Science and Medicine 2007; 65: 1965-78.

James O. Affluenza, London: Vermilion, 2007

Friedli L. Mental health, resilience and inequalities: how individuals and communities are affected, World Health Organisation. 2009.

Wilkinson RG, Pickett KE. The Spirit Level. Penguin. 2009. Buy the book from Amazon.