Gottesmans meta-analysis

• Gottesman performed a meta-analysis of 40 family studies and collated data for concordance rates for schiz for family members of schiz people
• conclusion - the closer you are related to someone with schiz, the greater the likelihood of developing the disorder
• Gottesman's findings supports the theory that genes play a role in the development of schiz
• however, Gottesman's data also suggest that genetics are not the only factor in developing the disorder
• the higher concordance rates in DZ twins is likely to be due to their closer environment when compared to siblings
• Gottesman's study can be criticised for not disentangling genetics from environmental influences - the closer you are genetically to someone, the closer the environments are likely to be
• the higher the concordance rates in those who are genetically related, could be explained by their closer environments