Demographics

Adults

As of August 29, 2014, the Registry has 8,665 adult twin pairs (17,330 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: 1.6%
20-29 years old: 24.9%
30-39 years old: 22.8%
40-49 years old: 14.4%
50-59 years old: 13.8%
60-69 years old: 13.6%
70-79 years old: 6.2%
80 years or older: 2.7%

Ethnicity:
Hispanic/Latino: 3.6%

Race:
White: 88.9%
Asian: 3.3%
Black: 2.4%
American Indian/Alaska Native: 2.1%
Pacific Islander: 0.5%
Other: 2.6%
More than one race: 0.3%

Zygosity:
Identical: 53.8%
Fraternal: 46.2%

Sex:
Male/Male pairs: 28.2%
Female/Female pairs: 49.9%
Male/Female pairs: 21.8%

 

Kids

As of August 29, 2014, the Registry has 415 youth twin pairs (830 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: 25.3%
5-9 years old: 13.0%
10-14 years old: 13.5%
15-17 years old: 48.2%

Ethnicity:
Hispanic/Latino: 8.9%

Race:
White: 80.7%
Asian: 4.3%
Black: 2.4%
American Indian/Alaska Native: 2.4%
Pacific Islander: 2.4%
Other: 6.7%
More than one race: 1.0%

Zygosity:
Identical: 51%
Fraternal: 49%

Sex:
Male/Male pairs: 30.1%
Female/Female pairs: 44.1%
Male/Female pairs: 25.8%

Where born:
Washington state: 80.3%
California: 5.3%
Oregon: 2.4%
Texas: 1.6%
Elsewhere in the USA: 7.3%
Outside of the USA: 3.1%