Heritability of Schizophrenia and Schizophrenia Spectrum Based on the Nationwide Danish Twin Register

Twin studies have provided evidence that both genetic and environmental factors contribute to schizophrenia (SZ) risk. Heritability estimates of SZ in twin samples have varied methodologically. This study provides updated heritability estimates based on nationwide twin data and an improved statistical methodology.Combining two nationwide registers, the Danish Twin Register and the Danish Psychiatric Research Register, we identified a sample of...