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112 families were studied. They either had MZ or DZ twins, plus a sibling between 9-14 years old and 2 parents.
The cognitive testing was based on Raven's Standard Progressive Matrices for the children and Raven's Advanced Progressive Matrices for the parents.
The families arrived between 9am-11am and with 3 breaks, the whole testing period was approximately 5 hours.
A model called the Rasch Model was applied, which takes into account the difficulty of each test question and calculates the probability of the person being able to score highly or lowly based on their individual ability.
Correlations were higher for MZ twins than first degree relatives (siblings, DZ twins and parent/child pairs).
There was quite a high correlation between the IQ of the parents. This suggests that the heritability estimate of intelligence was 67% (at 95% confidence rating) and the rest was a result of random environmental factors.
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