CZ:Ref:PMID:3307980

Torrey EF (1987). "Prevalence studies in schizophrenia". Br J Psychiatry 150: 598-608. PMID 3307980. ^[e]

A meta analysis of incidence rates of schizophrenia across human cultures, which range from below 1 in 1000 people in the Amish to about 2-5 in much of the world, and up to over 15 in some parts of Sweden and Ireland. These numbers rise further still if one only considers the susceptible age range (usually taken as between 16 and 40 years).