Key Findings:  This systematic review and meta-analysis found robust evidence to suggest that cannabis use, exposure to stressful events during childhood and adulthood, obstetric complications, and low serum folate levels correlate to a higher risk for developing schizophrenia spectrum disorders.
Type of Study:  Meta-analysis
Study Sample Size:  41
Study Result:  Negative
Research Location(s):  Brazil, Canada, Greece, Netherlands, Spain, United Kingdom
Year of Pub:  2018
Cannabinoids Studied:  Cannabinoid (unspecified)
Phytocannabinoid Source:  Not Applicable
Citation:  Belbasis L, et al. Risk factors and peripheral biomarkers for schizophrenia spectrum disorders: an umbrella review of meta-analyses. Acta Psychiatr Scand. 2018; 137:88-97. doi: 10.1111/acps.12847
Authors:  Belbasis L, Köhler CA, Stefanis N, Stubbs B, van Os J, Vieta E, Seeman MV, Arango C, Carvalho AF, Evangelou E