Psychosis incidence highly variable internationally -- ScienceDaily
Among the contributing factors under consideration, they found that the strongest area-level predictor of high rates of psychotic disorders was a low rate of owner-occupied housing. The researchers used owner-occupied housing as an indicator of socio-economic affluence and stability.
"Areas with higher rates of owner-occupied housing have lower rates of psychosis, which may be linked to social deprivation. People in areas that are socially deprived may have more social stresses, which could predict psychosis incidence, as suggested by other studies. An alternative explanation could be that owner-occupied housing is an indicator of social stability and cohesiveness, relating to stronger support networks," said the study's first author, Hannah Jongsma (University of Cambridge).
In line with previous research, higher incidence of psychosis was also associated with younger age (although the authors also identified a secondary peak in middle age among women), males, and ethnic minorities. A related paper investigating psychosis incidence in a rural region of England, also led by Dr Kirkbride and published last week in JAMA Psychiatry, found that while people from ethnic minorities are more likely to experience a psychotic disorder, these rates become lower in areas with a high degree of ethnic diversity -- both for the majority- and minority-ethnic individuals, potentially suggesting that greater social connections between individuals from different backgrounds is protective against some mental health issues.