Family studies: family studies have shown that schziophernia is more common among biological relatives than non-biological. children with two schziophernic paretns have a concordance rate 46% one schizophernica parent 13% siblings 9%. it has been shown that schizophernia can be down to reearing patterns and not genetics
Twin studies: Joseph (2004) calculated that the pooled data for all schizophernia twin studies, carried out prior to 2001 showed that of a concordance for mz twins of 40.4% and dz 7.4% - however it has been argued that this concordance rates reflect nothing more than the environemtal differences of the types of twins due to more confusion in e.g identity and share the same environments
Adoption studies: Tiernari et all (2002) found that 164 adoptees whose biological mother had been schizophernic, 6.7% were diagnosed compared to 2% of the control group. there are many reasons for this however, such as a diagnosis may have only been given this when the children were adopted into environments were it was able to develop.
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