For Enzo:
Apparently--and this was surprising to me--Americans are less likely to have any mental illness than their European counterparts.
European population studies
A 2004 cross-European study found that approximately one in four people reported meeting criteria at some point in their life for one of the DSM-IV disorders assessed, which included mood disorders (13.9%), anxiety disorders (13.6%) or alcohol disorder (5.2%). Approximately one in ten met criteria within a 12-month period. Women and younger people of either gender showed more cases of disorder ( Angermeyer, A., 2004)
A 2005 review of 27 studies have found that 27% of adult Europeans is or has been affected by at least one mental disorder in the past 12 months. It was also found that the most frequent disorders were anxiety disorders, depressive, somatoform and substance dependence disorders. ( Wittchen, J., 2005)
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References
Alonso J, Angermeyer MC, Bernert S, et al. (2004). "Prevalence of mental disorders in Europe: results from the European Study of the Epidemiology of Mental Disorders (ESEMeD) project". Acta Psychiatr Scand Suppl 109 (420): 21–7. doi:10.1111/j.1600-0047.2004.00327.x. PMID 15128384
Wittchen HU, Jacobi F (August 2005). "Size and burden of mental disorders in Europe--a critical review and appraisal of 27 studies". Eur Neuropsychopharmacol 15 (4): 357–76. doi:10.1016/j.euroneuro.2005.04.012. PMID 15961293.