Demographics

Adults

As of June 24, 2014, the Registry has 8,532 adult twin pairs (17,064 individuals). New pairs are enrolled every month. Below is a detailed breakdown of the UW Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age:
18-19 years old: 1.5%
20-29 years old: 25.7%
30-39 years old: 22.5%
40-49 years old: 14.4%
50-59 years old: 13.9%
60-69 years old: 13.3%
70-79 years old: 6.0%
80 years or older: 2.6%

Ethnicity:
Hispanic/Latino: 3.2%

Race:
White: 88.6%
Asian: 3.2%
Black: 2.1%
American Indian/Alaska Native: 2.3%
Pacific Islander: 0.7%
Other: 2.6%
More than one race: 0.4%

Zygosity:
Identical: 54%
Fraternal: 46%

Sex:
Male/Male pairs: 28.3%
Female/Female pairs: 49.7%
Male/Female pairs: 21.9%

 

Kids

As of June 24, 2014, the Registry has 349 youth twin pairs (698 individuals). New pairs are enrolled every month. Below is a detailed breakdown of the UW Twin Registry population, calculated from the survey that twins complete when they join the Registry.

Age:
4 years old and younger: 25.8%
5-9 years old: 13.2%
10-14 years old: 13.8%
15-17 years old: 47.3%

Ethnicity:
Hispanic/Latino: 9.8%

Race:
White: 78.8%
Asian: 5.6%
Black: 2.0%
American Indian/Alaska Native: 2.6%
Pacific Islander: 2.5%
Other: 7.2%
More than one race: 1.3%

Zygosity:
Identical: 51%
Fraternal: 49%

Sex:
Male/Male pairs: 31.4%
Female/Female pairs: 43.1%
Male/Female pairs: 25.5%

Where born:
Washington state: 81.1%
California: 5.4%
Oregon: 2.6%
Texas: 1.7%
Elsewhere in the USA: 6.4%
Outside of the USA: 2.8%