DNA methylation in schizophrenia: progress and challenges of epigenetic studies

Table 1 Examples of environmental factors implicated in schizophrenia

Environmental risk factors	Reference(s)
Viral infection during the fetal period	[4, 13]
Greater parental ages at the time of birth	[5]
Reduced nutrition during the fetal period and after birth	[6]
Perinatal abnormalities	[7]
Social stress	[8]
Living in urban areas	[9]
Immigration	[10]
Winter/spring birth	[11]
Cannabis use	[12]

ISSN: 1756-994X