Their cohort included a national sample of 4,674 Australians from the Australian twin Registry cohort II. Subjects included both identical and fraternal twins; 57 percent were women.
Their cohort included a national sample of 4, 674 Australians from the Australian Twin Registry Cohort II. Subjects included both identical and fraternal twins; 57 percent were women.
Researchers measure a trait, such as sensation-seeking, in identical and fraternaltwin pairs growing up in the same environment, and consider whether the two twin types are equally similar.