Van Leeuwen et al - Outline the sample used
112 families, either MZ or DZ twins, plus a sibling aged between 9-14 and 2 parents volunteered to take part. Mean age of twins 9.1, siblings 11.9, 23 male MZ twins, 23 DZ twins, 25 female MZ and 21 DZ, 20 DZ with opposite sex twins
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