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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Neuroimage. 2010 Oct 13;54(3):2308–2317. doi: 10.1016/j.neuroimage.2010.10.015

Table 1.

Demographic and IQ data, and family composition.

Adult (n = 531) Adolescent (n = 174)
 Age, years 23.7±2.1 12 or 16*
 Sex (M/F)§ 217/314 73/101
Full-scale IQ† 113.7±12.4 115.1±12.4
MZ pairs 93 26
 MZ pair plus one non-twin sibling 10 0
 DZ pairs 93 59
 DZ trizygotic triplets 4 1
 DZ pair plus one non-twin sibling 12 0
 DZ pair plus two non-twin siblings 1 0
 DTI data available in one co-twin only
  One co-twin with no siblings 33 1
  One co-twin and one non-twin sibling 17 0
  One co-twin and two non-twin siblings 1 0
 Single participants without siblings 7 0

MZ: monozygotic, DZ: dizygotic twins. The numbers of families with each type of twin and sibling composition are listed here. Values are displayed as Mean±SD.

*

The adolescent group consists of 86 subjects of age 12, and 88 subjects of age 16.

§

No significant difference in sex distribution was found between the adult and adolescent groups.

†

IQ tests were performed only when subjects were age 16 or older, and IQ data were available in 513 adult subjects and in all 88 subjects of age 16. There was no difference in full-scale IQ between the two groups.