Background—Income inequality is associated with numerous negative health outcomes. There is evidence that ecological level socio-environmental factors may increase risk for schizophrenia. Aims—The aim was to investigate whether measures of income inequality are associated with incidence of schizophrenia at the country level. Method—We conducted a systematic review of incidence rates for schizophrenia, reported between 1975 and 2011. For each country, national measures of income inequality (Gini coefficient) along with covariate risk factors for ...