The Colorado Twin Registry (CTR) is a population based registry housed at the Institute for Behavioral Genetics (IBG), University of Colorado. Recruitment has been ongoing since 1968. Four samples construct the CTR: the Community Twin Sample (CTS), Infant Twin Sample (ITS), Longitudinal Twin Sample (LTS), and the Early Reading Development Sample (ERDS). Criteria for enrollment, recruitment strategies, demographic information and zygosity assignment are explained for each sample. In addition, eight studies in which CTR twins have participated are highlighted. These include studies of early cognition, early reading ability, executive cognitive function, and vulnerability to substance abuse and antisocial behavior. Goals, measures, and brief results are provided for each study. The development of the CTR is an ongoing and evolving process, and it has proved to be a valuable resource, relatively representative of the population from which it was drawn.

Publication:

Rhea, S.A., Gross, A.A., Haberstick, B.C.,& Corley, R. P. (2006). Colorado Twin Registry.Twin Research and Human Genetics, 9(6), 941-9. PUBMED abstract

Supplemental Information:

Colorado Birth Statistics

  • Table 1: Parental Education for Colorado Births, Twin Births, and CTR Births 1984-2004.

  • Table 2: Maternal Ethnicity For Colorado Births, Twin Births and CTR Births 1984 - 2004.

  • Table 3: Percentage of White Non-Hispanic and White Hispanic Colorado Mothers for Colorado Births, Twin Births, and CTR Births 1984 - 2004.
  • Table 4: Ages of Colorado Parents for Colorado Births, Twin Births, and CTR Births 1984 - 2004.

Front Range Colorado Birth Statistics 
The Colorado front range includes the following counties: Larimer, Weld, Morgan, Boulder, Adams, Arapahoe, Denver, Jefferson, Gilpin, Summit, Clear Creek, Park, Douglas, Elbert, El Paso, Pueblo & Teller.

  • Table 1B: Parental Education for Front Range Colorado Births, Twin Births, and CTR Births 1984-2004.

  • Table 2B: Maternal Ethnicity For Front Range Colorado Births, Twin Births and CTR Births 1984 - 2004.
  • Table 3B: Percentage of White Non-Hispanic and White Hispanic Front Range Colorado Mothers for Colorado Births, Twin Births, and CTR Births 1984 - 2004.
  • Table 4B: Ages of Front RangeColorado Parents for Colorado Births, Twin Births, and CTR Births 1984 - 2004.