In an ecological study of the 24 counties of Sweden, the total and male suicide rates were not significantly associated with the average income per capita, while the correlation between female suicide rates and income was significant.
References
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Ferrada-NoliM.Social psychological versus socioeconomic hypotheses on the epidemiology of suicide. Psychological Reports, 1996, 79, 707–710.
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Stattstcska Centralbyran. Statistiskarsbok för Sverige, 1982/83. Stockholm: Statistiska Centralbyran1982.